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frontend/{index.html,app.js,style.css}: no build step, no npm, vanilla JS hash router (05 §5.7). Real page content is PH3 (U-022+, starting from docs/wireframes/); this is only the empty shell + working navigation the Done criterion asks for. backend_server.py serves the 3 files via an exact-path whitelist (not a generic static-file/directory server) -- no path-traversal surface to reason about for 3 fixed files. Verified in an actual browser this session (navigated to localhost, clicked all 3 nav links, screenshotted each) rather than only trusting stdlib tests -- a Python-only test can't exercise real hashchange/DOM behavior without a JS engine. Nav highlighting and content swap both confirmed working, no page reload, no build step. 7 new stdlib unittest cases covering what the server is actually responsible for (static files served with correct content-type, 404 on unknown GET path). 66 total across U-001-008, all passing. This closes out PH0 (U-001~U-008) -- all three Phase-acceptance criteria now hold for real: target-project directory scaffold, 15-table schema with constraint tests, and a real claude --agent round-trip. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
