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Closes the c_artifact_write gap U-011 flagged (03-C §3.7, unowned by any Unit despite REQ-02 needing it directly): src/artifact_write.py writes content to the target project, commits it to the target's own git history, validates depends_on_artifact_ids against existing rows before writing anything (REQ-02's failure case), creates the immutable artifact row. validation_status is set to 'passed' unconditionally -- noted as a real simplification (semantic content review, e.g. REQ-02's "PRD 里出现矛盾" boundary case, needs its own LLM-judgment step this codebase doesn't build yet). src/e2e_pipeline.py orchestrates architecture doc §11's MVP criteria 1-3: plan_documents() makes 4 real sequential Planner calls (BRD, then PRD referencing BRD, then SDD referencing PRD, then Benchmark referencing SDD), writing each via c_artifact_write with correct lineage. implement_code() calls Coder once, captures the resulting `git diff` as code_diff and the Coder's own response as test_report. validate_implementation() calls Validator once and parses an explicit 'VERDICT: PASS|FAIL|INCONCLUSIVE' line. run_end_to_end() chains create_task -> plan -> implement -> validate, using U-010's trigger_org_node_full only for task.status bookkeeping (a lightweight "confirm ready" call per phase) and plain org_node_trigger calls for actual content generation, since trigger_org_node_full's contract returns a status dict, not text. Real-verified: plan_documents ran for real against "实现贪吃蛇游戏" -- all 4 documents produced, correctly lineaged, validation_status=passed, real content (>100 chars each), ~5m45s total for the 4 sequential calls. Deliberately NOT run for real: run_end_to_end's Coder/Validator half (real code generation + real test execution) is a different order of magnitude in cost/time/uncertainty than every other real call this session -- built and mock-tested, but not executed without checking first. 19 new mocked stdlib unittest cases (4 for artifact_write, 5 for the pipeline orchestration, all real/unmocked for artifact_write since git operations are fast/free/local same as U-013's worktree tests) + 1 gated real test. 127 total mocked/real-local tests across U-001-014, all passing. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
