docs(impl): PR6 implementation note + STATUS update
Adds `pr6-routes-paths-workspace.md`:
- Scope summary (routes + repos + Paths + middleware + migration script + lifespan + T5.11)
- Per-task commit table (T5.11 + T6.1..T6.15)
- Acceptance checklist with the 64 net-new test count and 17 flake breakdown
- Architecture decisions (404 not 403, check_access signature, three-state semantics, path shape, fallback workspace)
- Live smoke command list for the migration follow-up
- File structure index (new vs modified)
Updates STATUS.md:
- One-line status moves to PR6 merged, T5.11 cleared as PR6 deliverable
- 8-PR status table: PR6 row marked merged with commit range and impl note link
- Skipped/deferred rows: T5.11 struck as completed, new PR6 T6.15 live-smoke row added
- Next-step suggestion switches to PR7 (CI boundary static scan); PR8 noted parallelisable
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