feat: implement project bus MVP

evidence/VERIFICATION.txt

@@ -0,0 +1,40 @@
+WP-PA-001 VERIFICATION
+Date: 2026-07-30
+Candidate version: 0.1.0
+
+RESULTS
+- Python source compilation: PASS
+- Source-tree test suite: PASS (16 tests)
+- Built/installed-package test suite: PASS (16 tests)
+- Installed-package migration smoke test: PASS
+- Local Git repository root initialized: PASS
+- External repository creation/push: NOT PERFORMED (by scope)
+- Container build: NOT RUN (Docker unavailable in execution environment)
+- Independent Claude review: PENDING
+- ChatGPT/Claude Code client interoperability: PENDING ACTIVATION
+
+COMMANDS
+PYTHONPATH=src python -m compileall -q src tests
+PYTHONPATH=src python -m unittest discover -v
+PIP_CACHE_DIR=/tmp/pip-cache python -m pip install --root-user-action=ignore --no-deps --no-build-isolation --target <temporary-directory> .
+PYTHONPATH=<temporary-directory> PROJECT_BUS_MIGRATIONS=<repository>/migrations python -m unittest discover -v
+
+SCOPE INTEGRITY
+- Canonical Sandbox ZIP SHA-256 after implementation:
+  9ca8ec98221146730c1ed82d8d5e2011b710d623ea046b7ab87a1d1cfb4e8bad
+- Handoff delta SHA-256 after implementation:
+  81fd1e58319299c4acfaf6c22bddacfe6f1de34ccfffac7943647d834aa912e6
+- Neither file exists inside this repository.
+
+PRE-VERIFICATION SOURCE SET
+- Files: 27
+- Aggregate SHA-256 over sorted per-file SHA-256 records:
+  e379541644e82fa4fd8096761625a0ec015528e51f20b21b13c9a7fa7bf53ce1
+- This aggregate intentionally excludes this VERIFICATION.txt file.
+
+REMAINING GATES
+1. Independent Claude security/architecture review using CLAUDE_REVIEW_BRIEF.md.
+2. Correction and re-verification of any findings.
+3. Exact MCP interoperability checks with intended ChatGPT and Claude Code versions.
+4. PM gate acceptance.
+5. Production hardening work package before internet-facing deployment.