test: gate the complete plan-to-deployment workflow

[EvanProgramming]

Closes #173.

This aggregate release-gate PR contains the repairs from #168–#172 and adds an installed-runtime acceptance path for the complete interaction workflow:

• project-scoped interaction and durable-task state across CLI/TUI/web
• exactly-once plan checklist materialization
• accepted-step mutation binding
• DeepSeek control normalization and stream sanitization
• effective Agent-mode projection while an accepted plan executes
• deterministic plan → approval → Agent execution → local HTTP deployment acceptance
• the same acceptance run against a newly built and installed wheel

It also fixes two partial scope consumers found by the aggregate gates: durable worker recovery/resume/event lookup and real browser interaction restoration now use the project interaction scope.

Validation:

• make test — 239 passed, including Playwright browser tests
• make check
• make lint
• make docs-check
• make shell-check
• make benchmark
• make agent-acceptance
• make wheel-smoke
• go test ./...
• go vet ./...
• git diff --check

Live-provider validation remains explicitly separate from the deterministic release gate and is not claimed by this PR.