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Implements the §P1 acceptance gate from plan-migration.md: a single POST /api/devloop/projects produces a runnable todo-demo project with multi-page PRD/SDD sites, units.json, integration spec, agent-state, and history snapshots — all via mock agents (no real Claude CLI cost). Code additions: - packages/acp-core/protocol/ClaudeCliProtocol.js * mock mode now emits an extra `mock/files` acp_event when the fixture contains a files[] array. LoopController applies it to the project root, letting mock agents produce real outputs. - server/src/core/devloop/loop-controller.js (now ~280 lines) * callAgent(pid, agentName, prompt, opts) — single-agent invocation: reads system/templates/{agent}/prompt.md, runs mock protocol, applies fixture files[], timeline-logs, auto-commits. * runDocsPhase(pid, requirement) — orchestrates PM → Architect with `docs.complete` timeline marker. * getProjectState(pid) — returns project.json + units + prd_rev/sdd_rev + timeline tail for the GET /state endpoint. - server/routes/devloop.js (new) * POST /api/devloop/projects — createProject + runDocsPhase * GET /api/devloop/projects * GET /api/devloop/projects/:pid/state - server/index.js / server/agent-server.js — mount /api/devloop. Mock fixtures (drive the full acceptance file tree): - fixtures/devloop-mock/devloop-pm.json * 14 files: prd/{index,reading-guide,product/*,feature/*,flow/*,prototype/*}.html, prd/assets/{shell.css,shell.js,search-index.json}, agent-state/{pm.json,pm-todo.json}, history/prd-rev-001.html. - fixtures/devloop-mock/devloop-architect.json * 13 files: sdd/{index,mvcp/*}.html, sdd/assets/*, units.json (3 units, DAG), integration/spec.json, agent-state/{architect.json,architect-todo.json}, history/sdd-rev-001.html. Acceptance: - scripts/phase1-verify.js — spins ephemeral express app, POSTs the todo-demo project, asserts 23 expected paths exist + 3 units with l2_rounds/l2_budget + git ≥4 commits + timeline events. Tests (12 new cases): - server/tests/devloop/loop-controller.test.js (7) — callAgent + runDocsPhase + state. - server/tests/devloop/routes.test.js (5) — POST validation, full POST, GET state, 404 on unknown pid. Results: - phase0-verify: 8/8 - phase0-test-call: 7/7 - phase1-verify: 7/7 - vitest devloop+acp-core: 174/174 (was 162 → +12) Specs: docs/prd/newfunction/_spec/plan-migration.md · P1 Docs MVP Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>