feat: introduce archify skill for generating architecture diagrams

- Added a new Archify skill, enabling users to create polished architecture, workflow, sequence, data-flow, and lifecycle diagrams. - Implemented comprehensive functionality including rendering, validation, and delivery of diagrams in various formats. - Integrated a user-friendly command-line interface for generating and previewing diagrams. - Developed supporting files including package.json, LICENSE, and SKILL.md for documentation and licensing. - Added unit tests to ensure reliability and functionality of the new skill. These changes enhance the application by providing a structured approach to visualizing system architecture and workflows, improving user experience and data representation.
2026-08-31 11:31:29 +07:00
parent 050fafd731
commit 166e0d40ac
221 changed files with 191228 additions and 1 deletions
@@ -0,0 +1,115 @@
+# Lifecycle Renderer
+
+Render `diagram_type: "lifecycle"` JSON files into the standard Archify HTML
+template.
+
+```bash
+node archify/renderers/lifecycle/render-lifecycle.mjs input.lifecycle.json output.html
+```
+
+The renderer validates input against `archify/schemas/lifecycle.schema.json`
+with the bundled standalone validator. No dependency installation is required.
+
+If `output.html` is omitted, the renderer uses `meta.output` from the JSON file
+or falls back to `lifecycle.html` in the current working directory.
+
+## Input
+
+Lifecycle JSON files must set:
+
+```json
+{
+  "schema_version": 1,
+  "diagram_type": "lifecycle",
+  "meta": {
+    "title": "Agent Run Lifecycle",
+    "viewBox": [980, 660]
+  },
+  "lanes": [],
+  "states": [],
+  "transitions": [],
+  "cards": []
+}
+```
+
+Lane ids are semantic and reserved: a lane with id `main` is required and maps
+to the top phase band; `terminal` maps to the bottom outcome band; every other
+lane id (up to 4 lanes total) shares the single middle event band. The three
+band headers render from your lane labels — the middle band joins the labels of
+all event lanes with ` + `. A complete worked example lives at
+`archify/examples/agent-run.lifecycle.json`.
+
+The schema lives at:
+
+```text
+archify/schemas/lifecycle.schema.json
+```
+
+## Legend
+
+The default legend derives kinds from `states[].type`. Supported
+`meta.legend.entries` keys, in stable order, are `start`, `active`, `waiting`,
+`decision`, `success`, `failure`, `neutral`, and `external`. Labels and
+visibility may be overridden through the shared legend contract; only kinds
+backed by rendered states receive Semantic Legend controls.
+
+## Layout budget
+
+| Band | Lane id | Top y | Column centers | Default state |
+|------|---------|-------|----------------|---------------|
+| Phase | `main` (required) | 126 | `col` 0–4 → x = 94, 248, 402, 556, 710 | 118×62 |
+| Event | any other id | 278 | `col` 0–2 → x = 402, 556, 710 | 126×58 |
+| Outcome | `terminal` | 450 | `col` 0–2 → x = 402, 556, 710 | 118×58 |
+
+Event and terminal columns are intentionally offset from the main rail:
+event/terminal `col: N` uses the same x coordinate as main `col: N + 2`.
+For example, lower-band columns 0, 1, and 2 align beneath main columns 2, 3,
+and 4 respectively.
+
+| Constant | Value |
+|----------|-------|
+| viewBox | default `[980, 660]`; schema minimum `[420, 566]` |
+| State area | x within `[32, width − 32]`; state bottom at or above `height − 122` |
+| State spacing | ≥10px between any two states — checked across lanes, because all event lanes share one band; separate same-band states with `col` or `yOffset` |
+| Transition length | ≥32px between endpoints |
+| Legend row | final baseline y = height − 36; extra measured rows wrap upward |
+
+The primary lifecycle rail runs along the phase band and extends to the
+furthest occupied phase column. Route presets for transitions: `straight`,
+`drop` (bend at `channelY`, defaulting to the vertical midpoint),
+`bottom-channel`, `top-channel`, `right-channel`, `left-channel`, explicit
+`via` points, or the default `auto`. Multi-segment transitions get rounded
+corners; tune them with `cornerRadius` (default 10, `0` for sharp bends).
+
+## Design Rules
+
+- Treat lifecycle diagrams as a phase map, not a dense state-transition graph.
+- Put the primary lifecycle on one horizontal rail using the `main` lane.
+- Use `step` labels for ordered phases, such as `01`, `02`, and `03`.
+- Use lower lanes only for interruptions, recovery, and terminal exits.
+- Keep transition labels out of the main SVG unless the label is essential;
+  prefer node labels, tags, legend entries, and summary cards.
+- Avoid diagonal and crossing lines. Terminal exits should drop vertically from
+  their source event whenever possible.
+- Use `success` for completion, `failure` for failure/terminal exits,
+  `waiting` for pauses, and `decision` for quality gates.
+
+Schema violations exit non-zero with path-prefixed messages annotated with the
+element's id or label. The renderer additionally fails when it can detect
+layout problems, including a missing `main` lane, duplicate state IDs, unknown
+lanes, unknown transition endpoints, states outside the lifecycle area,
+overlapping states (including across lanes), labels colliding with states or
+other labels, labels wider than their state, unreadably short transitions, or
+transitions crossing unrelated states (2px Clean Flow clearance). Lifecycle
+bands remain intentional pass-through containers.
+Text width is estimated CJK-aware: fullwidth glyphs count as two units.
+
+Set `meta.quality_profile` to `showcase` for polished delivery. Unrelated proper
+X crossings then fail with `composition/proper-crossing`; default `standard`
+keeps them as artifact-receipt warnings. The final artifact check samples
+rounded `Q` corners. Collinear corridors remain outside the proper-X rule, but
+a separate gate warns in `standard` and fails in `showcase` when unrelated
+transitions overlap for at least 8px. Shared semantic endpoints, point touches,
+and shorter overlaps remain valid. Showcase also rejects any route segment
+below 8px and any interior turn segment below 16px; ordinary 8–15px endpoint
+stubs remain valid.
@@ -0,0 +1,561 @@
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { esc, renderDefinitions, renderSemanticSigil, textUnits } from '../shared/utils.mjs';
+import { animateAttr, focusEdgeAttrs, focusNodeAttrs, focusNodeTitle, loadDiagramWithBrandMarks, writeDiagram, svgAccessibleText, svgRootAttrs } from '../shared/cli.mjs';
+import { throwDiagnosticProblems } from '../shared/diagnostics.mjs';
+import { resolveLegend, renderLegend as renderResolvedLegend } from '../shared/legend.mjs';
+import { availableNodeTextWidth, fittedNodeFontSize, minimumNodeTextWidth } from '../shared/text-fit.mjs';
+import { brandLabelFitWidth, brandMarkFor, brandMetadataFor, brandTopRailProblem, renderBrandMark } from '../shared/brand-marks.mjs';
+import { translateMessage as i18nText } from '../shared/i18n.mjs';
+import {
+  asArray,
+  isFinitePoint,
+  rectsOverlap,
+  cleanEndpointSideProblems,
+  cleanFlowProblems,
+  cleanCrossingProblems,
+  cleanAmbiguousCorridorProblems,
+  cleanBorderRunProblems,
+  cleanRouteRhythmProblems,
+  cleanLabelRouteClearanceProblems,
+  suggestLabelObstacleFix,
+  suggestLabelPairFix,
+  anchor,
+  automaticPortSpread,
+  defaultFromSide,
+  defaultToSide,
+  chosenSide,
+  roundedPath,
+  routePointsValue,
+  labelPoint,
+  arrowClassMap,
+  variantAccent
+} from '../shared/geometry.mjs';
+
+const stateTextFit = {
+  sublabelPreferred: 7,
+  sublabelMinimum: 6,
+  tagPreferred: 7,
+  tagMinimum: 6,
+};
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const { diagram: lifecycle, template, outPath } = await loadDiagramWithBrandMarks({
+  rendererDir: __dirname,
+  diagramType: 'lifecycle',
+  defaultExample: 'agent-run.lifecycle.json'
+});
+
+const viewBox = lifecycle.meta?.viewBox || [980, 660];
+const layout = {
+  phaseY: 126,
+  eventY: 278,
+  outcomeY: 450,
+  phaseW: 118,
+  phaseH: 62,
+  eventW: 126,
+  eventH: 58,
+  outcomeW: 118,
+  outcomeH: 58,
+  phaseXs: [94, 248, 402, 556, 710],
+  eventXs: [402, 556, 710],
+  outcomeXs: [402, 556, 710]
+};
+
+const typeClass = {
+  start: 'c-frontend',
+  active: 'c-backend',
+  waiting: 'c-cloud',
+  decision: 'c-security',
+  success: 'c-database',
+  failure: 'c-security',
+  neutral: 'c-external',
+  external: 'c-external'
+};
+
+const textClass = {
+  start: 't-frontend',
+  active: 't-backend',
+  waiting: 't-cloud',
+  decision: 't-security',
+  success: 't-database',
+  failure: 't-security',
+  neutral: 't-muted',
+  external: 't-muted'
+};
+
+function legendY() {
+  return viewBox[1] - 36;
+}
+
+// Keep the authored state-placement contract independent from the measured
+// legend's lower baseline. Moving legend chrome must not admit new state
+// geometry into the reserved outcome/legend band.
+function lifecycleAreaBottom() {
+  return viewBox[1] - 122;
+}
+
+// Lane semantics are fixed: lane id "main" maps to the top phase band, lane id
+// "terminal" maps to the bottom outcome band, and every other lane shares the
+// middle event band (separated visually via yOffset).
+function bandFor(lane) {
+  if (lane === 'main') return 'phase';
+  if (lane === 'terminal') return 'outcome';
+  return 'event';
+}
+
+function measureState(state) {
+  const isPhase = bandFor(state.lane) === 'phase';
+  const isOutcome = bandFor(state.lane) === 'outcome';
+  const width = state.width || (isPhase ? layout.phaseW : isOutcome ? layout.outcomeW : layout.eventW);
+  const height = state.height || (isPhase ? layout.phaseH : isOutcome ? layout.outcomeH : layout.eventH);
+  const xs = isPhase ? layout.phaseXs : isOutcome ? layout.outcomeXs : layout.eventXs;
+  const cx = xs[state.col] ?? xs[xs.length - 1];
+  const y = (
+    isPhase ? layout.phaseY :
+      isOutcome ? layout.outcomeY :
+        layout.eventY
+  ) + (state.yOffset || 0);
+  return {
+    ...state,
+    width,
+    height,
+    x: cx - width / 2,
+    y,
+    cx,
+    cy: y + height / 2
+  };
+}
+
+const states = new Map(asArray(lifecycle.states).map((state) => [state.id, measureState(state)]));
+const laneLabels = new Map(asArray(lifecycle.lanes).map((lane) => [lane.id, lane.label]));
+const stateSteps = new Map();
+for (const [index, transition] of asArray(lifecycle.transitions).entries()) {
+  if (!stateSteps.has(transition.from)) stateSteps.set(transition.from, index);
+  if (!stateSteps.has(transition.to)) stateSteps.set(transition.to, index + 1);
+}
+for (const [index, state] of asArray(lifecycle.states).entries()) {
+  if (!stateSteps.has(state.id)) stateSteps.set(state.id, index);
+}
+
+function validateLifecycle() {
+  const problems = [];
+  if (states.size !== asArray(lifecycle.states).length) problems.push('State ids must be unique.');
+
+  // The three bands are fixed at y=112/264/436. Preserve the original
+  // outcome/legend reserve even though measured legend rows now sit lower.
+  if (lifecycleAreaBottom() + 4 < 448) {
+    problems.push(`viewBox height ${viewBox[1]} is too short for the fixed band layout — set meta.viewBox[1] to at least 566.`);
+  }
+
+  const laneIds = new Set(asArray(lifecycle.lanes).map((lane) => lane.id));
+  if (laneIds.size !== asArray(lifecycle.lanes).length) problems.push('Lane ids must be unique.');
+  if (!laneIds.has('main')) {
+    problems.push('Lifecycle diagrams need a lane with id "main" (the phase rail). Lane ids "main" and "terminal" are reserved: "main" maps to the top phase band, "terminal" to the bottom outcome band, and all other lanes share the middle event band.');
+  }
+
+  for (const state of states.values()) {
+    if (!laneIds.has(state.lane)) {
+      problems.push(`State "${state.id}" uses unknown lane "${state.lane}".`);
+      continue;
+    }
+    const band = bandFor(state.lane);
+    const maxCol = band === 'phase'
+      ? layout.phaseXs.length
+      : band === 'outcome'
+        ? layout.outcomeXs.length
+        : layout.eventXs.length;
+    if (!Number.isInteger(state.col) || state.col < 0 || state.col >= maxCol) {
+      problems.push(`State "${state.id}" uses invalid column ${state.col} — the ${band} band has integer columns 0..${maxCol - 1}.`);
+      continue;
+    }
+    if (!isFinitePoint(state.x, state.y, state.cx, state.cy)) {
+      problems.push(`State "${state.id}" produced non-finite coordinates — check col, width, height, and yOffset are numbers.`);
+      continue;
+    }
+    if (state.x < 32 || state.x + state.width > viewBox[0] - 32) {
+      problems.push(`State "${state.id}" exceeds the horizontal bounds of the diagram — reduce state.width or increase meta.viewBox[0].`);
+    }
+    if (state.y < 64 || state.y + state.height > lifecycleAreaBottom()) {
+      problems.push(`State "${state.id}" exceeds the vertical lifecycle area — keep y between 64 and ${lifecycleAreaBottom()} (adjust yOffset or increase meta.viewBox[1]).`);
+    }
+    const estLabelW = textUnits(state.label) * 6.2;
+    if (estLabelW > state.width + 6) {
+      problems.push(`Label "${state.label}" (~${Math.round(estLabelW)}px) is wider than state "${state.id}" (${state.width}px) — shorten the label or increase state.width.`);
+    }
+    const brandRailProblem = brandTopRailProblem(state, state.width, 8, 'State');
+    if (brandRailProblem) problems.push(brandRailProblem);
+    // sublabel and tag render as single unwrapped <text> elements; shrink-to-fit
+    // handles the ordinary case, this rejects what it cannot rescue.
+    const availableTextW = availableNodeTextWidth(state.width);
+    for (const [field, value, minimum] of [
+      ['Sublabel', state.sublabel, stateTextFit.sublabelMinimum],
+      ['Tag', state.tag, stateTextFit.tagMinimum],
+    ]) {
+      if (!value) continue;
+      const minimumW = minimumNodeTextWidth(value, minimum);
+      if (minimumW > availableTextW) {
+        problems.push(`${field} "${value}" needs ~${Math.ceil(minimumW)}px at the ${minimum}px legible minimum, but state "${state.id}" provides ${availableTextW}px — shorten the ${field.toLowerCase()} or increase state.width.`);
+      }
+    }
+  }
+
+  // All non-main/non-terminal lanes share the same y band, so the overlap
+  // check must run across lanes — not per-lane.
+  const allStates = [...states.values()];
+  for (let i = 0; i < allStates.length; i += 1) {
+    for (let j = i + 1; j < allStates.length; j += 1) {
+      if (rectsOverlap(allStates[i], allStates[j], 10)) {
+        problems.push(`States "${allStates[i].id}" and "${allStates[j].id}" are less than 10px apart — move one to another col or separate them with yOffset (lanes other than "main"/"terminal" share one band).`);
+      }
+    }
+  }
+
+  for (const transition of asArray(lifecycle.transitions)) {
+    if (!states.has(transition.from)) problems.push(`Transition "${transition.label || transition.from}" references unknown source "${transition.from}".`);
+    if (!states.has(transition.to)) problems.push(`Transition "${transition.label || transition.to}" references unknown target "${transition.to}".`);
+    if (states.has(transition.from) && states.has(transition.to)) {
+      const routed = pathFor(transition);
+      const [start, end] = [routed.points[0], routed.points[routed.points.length - 1]];
+      const distance = Math.hypot(end[0] - start[0], end[1] - start[1]);
+      if (distance < 32) problems.push(`Transition "${transition.label || `${transition.from}->${transition.to}`}" is too short (${Math.round(distance)}px; minimum 32px) — route it through a channel or drop its label.`);
+    }
+  }
+
+  // Authored via points are authoritative in schema v1, including under a
+  // quality profile. Preserve and render them exactly: applying the endpoint
+  // gate would either reject an existing typed input or require silently
+  // falsifying its geometry. Automatic routes still receive the side gate.
+  problems.push(...cleanEndpointSideProblems({
+    relations: lifecycle.transitions,
+    endpointIds: new Set(states.keys()),
+    pathFor,
+    diagramType: 'lifecycle',
+    relationCollection: 'transitions',
+    fromSideFor: (transition) => transitionSides(transition).fromSide,
+    toSideFor: (transition) => transitionSides(transition).toSide,
+    shouldCheckRelation: (transition) => !Array.isArray(transition.via),
+    routeHint: 'keep automatic routing, or choose fromSide/toSide and via points whose first and final segments cross state borders perpendicularly',
+  }));
+  problems.push(...cleanFlowProblems({
+    relations: lifecycle.transitions,
+    obstacles: states.values(),
+    pathFor,
+    diagramType: 'lifecycle',
+    relationCollection: 'transitions',
+    obstacleKind: 'state',
+    routeHint: 'adjust fromSide/toSide, set route/via or channelX/channelY, or move the state with col/yOffset'
+  }));
+  problems.push(...cleanCrossingProblems({
+    relations: lifecycle.transitions,
+    endpointIds: new Set(states.keys()),
+    pathFor,
+    diagramType: 'lifecycle',
+    relationCollection: 'transitions',
+    profile: lifecycle.meta?.quality_profile,
+    routeHint: 'adjust route/via or channelX/channelY so the transitions use separate lifecycle corridors'
+  }));
+  problems.push(...cleanAmbiguousCorridorProblems({
+    relations: lifecycle.transitions,
+    endpointIds: new Set(states.keys()),
+    pathFor,
+    diagramType: 'lifecycle',
+    relationCollection: 'transitions',
+    profile: lifecycle.meta?.quality_profile,
+    routeHint: 'adjust route/via or channelX/channelY so unrelated transitions do not visually merge'
+  }));
+  // Lifecycle bands are dashed reading guides, not closed containers. Keep the
+  // shared contract wired with an explicit empty frame set so future typed
+  // lifecycle containers cannot accidentally inherit presentation geometry.
+  problems.push(...cleanBorderRunProblems({
+    relations: lifecycle.transitions,
+    endpointIds: new Set(states.keys()),
+    frames: [],
+    pathFor,
+    diagramType: 'lifecycle',
+    relationCollection: 'transitions',
+    profile: lifecycle.meta?.quality_profile
+  }));
+  problems.push(...cleanRouteRhythmProblems({
+    relations: lifecycle.transitions,
+    endpointIds: new Set(states.keys()),
+    pathFor,
+    diagramType: 'lifecycle',
+    relationCollection: 'transitions',
+    profile: lifecycle.meta?.quality_profile,
+    routeHint: 'move route/via or channel coordinates so each lifecycle turn has a readable run-up'
+  }));
+
+  const labelRects = [];
+  for (const [transitionIndex, transition] of asArray(lifecycle.transitions).entries()) {
+    if (!transition.label || !states.has(transition.from) || !states.has(transition.to)) continue;
+    const [lx, ly] = labelPoint(transition, pathFor(transition).points);
+    const longestLine = Math.max(textUnits(transition.label), textUnits(transition.note || ''));
+    const width = Math.max(32, longestLine * 4.9 + 12);
+    const height = transition.note ? 27 : 16;
+    labelRects.push({ relation: transition, relationIndex: transitionIndex, label: transition.label, x: lx - width / 2, y: ly - 11, width, height, lx, ly });
+  }
+  for (const rect of labelRects) {
+    for (const state of states.values()) {
+      if (rectsOverlap(rect, state, -2)) {
+        problems.push(`Label "${rect.label}" overlaps state "${state.id}" — adjust labelDx/labelDy/labelSegment or set labelAt.\n${suggestLabelObstacleFix(rect, rect.lx, rect.ly, state, 'state')}`);
+      }
+    }
+  }
+  for (let i = 0; i < labelRects.length; i += 1) {
+    for (let j = i + 1; j < labelRects.length; j += 1) {
+      if (rectsOverlap(labelRects[i], labelRects[j], -2)) {
+        problems.push(`Labels "${labelRects[i].label}" and "${labelRects[j].label}" overlap — adjust labelDx/labelDy.\n${suggestLabelPairFix(labelRects[i], labelRects[j])}`);
+      }
+    }
+  }
+  problems.push(...cleanLabelRouteClearanceProblems({
+    relations: lifecycle.transitions,
+    labels: labelRects,
+    endpointIds: new Set(states.keys()),
+    pathFor,
+    diagramType: 'lifecycle',
+    relationCollection: 'transitions',
+    profile: lifecycle.meta?.quality_profile,
+  }));
+
+  if (problems.length) {
+    throwDiagnosticProblems('Lifecycle layout validation failed', problems, {
+      subject: { diagramType: 'lifecycle' },
+    });
+  }
+}
+
+function routeVia(transition, from, to, start, end, fromSide, toSide) {
+  if (transition.via) return transition.via;
+  switch (transition.route || 'auto') {
+    case 'straight':
+      return [];
+    case 'drop': {
+      const y = transition.channelY ?? (start[1] + end[1]) / 2;
+      return [[start[0], y], [end[0], y]];
+    }
+    case 'bottom-channel': {
+      const y = transition.channelY ?? Math.max(from.y + from.height, to.y + to.height) + 34;
+      return [[start[0], y], [end[0], y]];
+    }
+    case 'top-channel': {
+      const y = transition.channelY ?? Math.min(from.y, to.y) - 28;
+      return [[start[0], y], [end[0], y]];
+    }
+    case 'right-channel': {
+      const x = transition.channelX ?? Math.max(from.x + from.width, to.x + to.width) + 36;
+      return [[x, start[1]], [x, end[1]]];
+    }
+    case 'left-channel': {
+      const x = transition.channelX ?? Math.min(from.x, to.x) - 36;
+      return [[x, start[1]], [x, end[1]]];
+    }
+    case 'auto':
+    default: {
+      if (start[0] === end[0] || start[1] === end[1]) return [];
+      const fromVertical = fromSide === 'top' || fromSide === 'bottom';
+      const toVertical = toSide === 'top' || toSide === 'bottom';
+      if (fromVertical !== toVertical) {
+        return [fromVertical ? [start[0], end[1]] : [end[0], start[1]]];
+      }
+      if (fromVertical) {
+        const y = transition.channelY ?? (start[1] + end[1]) / 2;
+        return [[start[0], y], [end[0], y]];
+      }
+      const x = transition.channelX ?? (start[0] + end[0]) / 2;
+      return [[x, start[1]], [x, end[1]]];
+    }
+  }
+}
+
+const pathCache = new Map();
+
+function transitionSides(transition) {
+  const from = states.get(transition.from);
+  const to = states.get(transition.to);
+  return {
+    fromSide: chosenSide(transition.fromSide, defaultFromSide(from, to)),
+    toSide: chosenSide(transition.toSide, defaultToSide(from, to)),
+  };
+}
+
+const automaticPorts = automaticPortSpread(lifecycle.transitions, states, {
+  sideFor: (transition, endpoint) => transitionSides(transition)[endpoint === 'source' ? 'fromSide' : 'toSide'],
+});
+
+function pathFor(transition) {
+  if (pathCache.has(transition)) return pathCache.get(transition);
+  const from = states.get(transition.from);
+  const to = states.get(transition.to);
+  const ports = automaticPorts.get(transition);
+  const { fromSide, toSide } = transitionSides(transition);
+  const start = ports?.from || anchor(from, fromSide);
+  const end = ports?.to || anchor(to, toSide);
+  let via = routeVia(transition, from, to, start, end, fromSide, toSide);
+  if (ports && !via.length && Math.abs(start[0] - end[0]) >= 4 && Math.abs(start[1] - end[1]) >= 4) {
+    const midX = (start[0] + end[0]) / 2;
+    via = [[midX, start[1]], [midX, end[1]]];
+  }
+  const points = [start, ...via, end];
+  const routed = {
+    d: roundedPath(points, transition.cornerRadius ?? 10),
+    points
+  };
+  pathCache.set(transition, routed);
+  return routed;
+}
+
+function bandTitles() {
+  const lanes = asArray(lifecycle.lanes);
+  const mainLane = lanes.find((lane) => lane.id === 'main');
+  const terminalLane = lanes.find((lane) => lane.id === 'terminal');
+  const eventLanes = lanes.filter((lane) => lane.id !== 'main' && lane.id !== 'terminal');
+  return [
+    mainLane?.label || 'Lifecycle phases',
+    eventLanes.length ? eventLanes.map((lane) => lane.label).join(' + ') : 'Interruptions + recovery',
+    terminalLane?.label || 'Outcomes'
+  ];
+}
+
+function renderBands() {
+  const right = viewBox[0] - 72;
+  const titles = bandTitles();
+  return `        <path d="M 72 112 L ${right} 112" class="a-default" stroke-width="0.8" stroke-dasharray="3,8"/>
+        <text x="72" y="100" class="t-dim" font-size="10" font-weight="600">01 / ${esc(titles[0])}</text>
+        <path d="M 72 264 L ${right} 264" class="a-default" stroke-width="0.8" stroke-dasharray="3,8"/>
+        <text x="72" y="252" class="t-dim" font-size="10" font-weight="600">02 / ${esc(titles[1])}</text>
+        <path d="M 72 436 L ${right} 436" class="a-default" stroke-width="0.8" stroke-dasharray="3,8"/>
+        <text x="72" y="424" class="t-dim" font-size="10" font-weight="600">03 / ${esc(titles[2])}</text>`;
+}
+
+function renderState(state) {
+  const fill = typeClass[state.type] || typeClass.neutral;
+  const accent = textClass[state.type] || 't-muted';
+  const hasSub = state.sublabel != null && state.sublabel !== '';
+  const sub = hasSub
+    ? `\n          <text data-detail="context" x="${state.cx}" y="${state.y + 37}" class="t-muted" font-size="${fittedNodeFontSize(state.sublabel, state.width, stateTextFit.sublabelPreferred, stateTextFit.sublabelMinimum)}" text-anchor="middle">${esc(state.sublabel)}</text>`
+    : '';
+  const tag = state.tag
+    ? `\n        <text data-detail="fine" x="${state.cx}" y="${state.y + state.height - 11}" class="${accent}" font-size="${fittedNodeFontSize(state.tag, state.width, stateTextFit.tagPreferred, stateTextFit.tagMinimum)}" text-anchor="middle">${esc(state.tag)}</text>`
+    : '';
+  const hasBrand = Boolean(brandMarkFor(state));
+  const step = state.step
+    ? `\n        <text data-detail="fine" x="${state.x + (hasBrand ? 23 : 10)}" y="${state.y + 14}" class="${accent}" font-size="7" font-weight="700">${esc(state.step)}</text>`
+    : '';
+  const brand = renderBrandMark(state, { x: state.x + state.width - 22, y: state.y + 6 });
+  const labelFontSize = fittedNodeFontSize(state.label, brandLabelFitWidth(state, state.width), 10, 8);
+  const passport = {
+    kind: state.type,
+    sublabel: state.sublabel,
+    tag: state.tag,
+    context: laneLabels.get(state.lane) || i18nText(lifecycle.meta.locale, 'node.context.lifecycle'),
+    ...brandMetadataFor(state),
+  };
+  return `        <g ${focusNodeAttrs(state.id, state.label, passport, lifecycle.meta.locale)}>
+          ${focusNodeTitle(state.label, passport)}
+          <rect x="${state.x}" y="${state.y}" width="${state.width}" height="${state.height}" rx="7" class="c-mask"/>
+          <rect x="${state.x}" y="${state.y}" width="${state.width}" height="${state.height}" rx="7" class="${fill}"${animateAttr(lifecycle.meta, 'node', stateSteps.get(state.id))} stroke-width="1.5"/>
+          ${renderSemanticSigil(state.type, { x: hasBrand ? state.x + 6 : state.x + state.width - 17, y: state.y + 6 })}${brand ? `\n          ${brand}` : ''}${step}
+          <text data-node-label=""${hasSub ? ' data-detail-anchor=""' : ''} x="${state.cx}" y="${state.y + 21}" class="t-primary" font-size="${labelFontSize}" font-weight="600" text-anchor="middle">${esc(state.label)}</text>${sub}${tag}
+        </g>`;
+}
+
+function renderTransitionPath(transition, index) {
+  const [cls, marker] = arrowClassMap[transition.variant || 'default'] || arrowClassMap.default;
+  const routed = pathFor(transition);
+  const strokeWidth = transition.width || (transition.variant === 'emphasis' ? 2 : 1.1);
+  return `        <path ${focusEdgeAttrs(transition.from, transition.to, transition.label, index, transition.id)} data-composition-points="${routePointsValue(routed.points)}" d="${routed.d}" class="${cls}"${animateAttr(lifecycle.meta, 'edge', index)} stroke-width="${strokeWidth}" marker-end="url(#${marker})"/>`;
+}
+
+function renderTransitionLabel(transition, index) {
+  if (!transition.label) return '';
+  const routed = pathFor(transition);
+  const [lx, ly] = labelPoint(transition, routed.points);
+  const longestLine = Math.max(textUnits(transition.label), textUnits(transition.note || ''));
+  const labelW = Math.max(32, longestLine * 4.9 + 12);
+  const labelH = transition.note ? 27 : 16;
+  const note = transition.note
+    ? `\n        <text data-detail="fine" x="${lx}" y="${ly + 11}" class="t-dim" font-size="7" text-anchor="middle">${esc(transition.note)}</text>`
+    : '';
+  return `        <g data-detail="context" ${focusEdgeAttrs(transition.from, transition.to, transition.label, index, transition.id)}>
+          <rect x="${lx - labelW / 2}" y="${ly - 11}" width="${labelW}" height="${labelH}" rx="4" class="c-mask"/>
+          <text x="${lx}" y="${ly}" class="${variantAccent(transition.variant)}" font-size="8" text-anchor="middle">${esc(transition.label)}</text>${note}
+        </g>`;
+}
+
+const LEGEND_CATALOG = [
+  'start',
+  'active',
+  'waiting',
+  'decision',
+  'success',
+  'failure',
+  'neutral',
+  'external',
+].map((kind) => ({ kind, label: i18nText(lifecycle.meta.locale, `legend.lifecycle.${kind}`) }));
+
+function renderLegend() {
+  const presentKinds = new Set([...states.values()].map((state) => state.type));
+  const entries = resolveLegend(lifecycle.meta?.legend, LEGEND_CATALOG, presentKinds);
+  return renderResolvedLegend({
+    entries,
+    locale: lifecycle.meta.locale,
+    layout: {
+      x: 40,
+      baselineY: legendY(),
+      width: viewBox[0] - 80,
+      minTitleY: lifecycleAreaBottom() + 8,
+      unfit: lifecycle.meta?.legend === undefined ? 'hide' : 'error',
+      diagramType: 'lifecycle',
+    },
+    renderSwatch: (entry) => `<rect x="${entry.x}" y="${entry.baseline - 8}" width="14" height="9" rx="2" class="${typeClass[entry.kind] || 'c-external'}" stroke-width="1"/>`,
+  });
+}
+
+function renderLifecycleRail() {
+  const mainCols = [...states.values()]
+    .filter((state) => bandFor(state.lane) === 'phase')
+    .map((state) => state.col);
+  if (!mainCols.length) return '';
+  const railEnd = layout.phaseXs[Math.max(...mainCols)] + 38;
+  return `        <path d="M 154 ${layout.phaseY + 31} L ${railEnd} ${layout.phaseY + 31}" class="a-emphasis" stroke-width="2.2" marker-end="url(#arrowhead-emphasis)"/>`;
+}
+
+function renderSvg() {
+  return `      <svg viewBox="0 0 ${viewBox[0]} ${viewBox[1]}" ${svgRootAttrs(lifecycle.meta)}>
+${svgAccessibleText(lifecycle.meta, 'lifecycle')}
+${renderDefinitions()}
+
+        <!-- Background Grid -->
+        <rect width="100%" height="100%" fill="url(#grid)" />
+
+        <!-- Lifecycle bands -->
+${renderBands()}
+
+        <!-- Primary lifecycle rail -->
+${renderLifecycleRail()}
+
+        <!-- Transition paths -->
+${asArray(lifecycle.transitions).map(renderTransitionPath).join('\n')}
+
+        <!-- States -->
+${[...states.values()].map(renderState).join('\n\n')}
+
+        <!-- Transition labels -->
+${asArray(lifecycle.transitions).map(renderTransitionLabel).join('\n')}
+
+        <!-- Legend -->
+${renderLegend()}
+      </svg>`;
+}
+
+validateLifecycle();
+writeDiagram({
+  outPath,
+  template,
+  diagramType: 'lifecycle',
+  meta: lifecycle.meta,
+  svg: renderSvg(),
+  cards: lifecycle.cards,
+});