Closes construction - build and test across all seven units

Unit suites already passed individually; this is the full solution
together plus what none of them could check alone: two real hosts
talking to each other, a slave API key encrypted by one process and
decrypted by the next one after a restart, and headers landing on
actual static files instead of a simulated response.

aidlc-docs/features/gitea-deployment-workflow/aidlc-state.md

@@ -70,7 +70,7 @@ Execution rounds (Q4 = B): **R1** = U1 + U2 · **R2** = U3 + U4 · **R3** = U5 +
 - [x] NFR Design — **EXECUTE for U3, U4**; SKIP for the rest. *Deliberate deviation from the default NFR-Requirements/NFR-Design coupling — rationale in the execution plan.* **U3 ✅ U4 ✅** 2026-07-28 — 11 patterns for U3, 10 for U4. Closed OPEN-01; raised REF-U3-01
 - [x] Infrastructure Design — **EXECUTE for U6, U7 per the original plan; SKIP for the rest**. **U6 ✅** 2026-07-28 — single Pi, directory-only environment split, `systemd --user` (no sudo), releases/current/shared layout, 2-release retention, health check via public URL. Raised INFRA-U6-01 (linger requirement, carried to Operations). **U7 did not need it in practice**: by Units Generation, U7's scope had narrowed to documentation-only (Q8 = A — operational/infrastructure decisions moved to Operations), so it went straight to Code Generation with no infrastructure to design
 - [x] Code Generation — **EXECUTE** (all 7 units, each built and tested before its completion message). **U1 ✅ U2 ✅** 2026-07-27 (253 backend tests). **U3 ✅** 2026-07-28 (315). **U4 ✅** 2026-07-28 (366 backend + 237 frontend). **U6 ✅ U5 ✅** 2026-07-28 — Round 3: `deploy-scp.yaml` + `continuous_integration.yaml`, 372 backend + 237 frontend tests (unchanged from Round 2, confirming no regressions from FR-21/FR-22 fixes), 0 vulnerable packages, lint clean. Raised REF-U5-01 (Umami-origin gate needs a parallel Gitea variable, since the backend side is a host env var per D-16). **U7 ✅** 2026-07-28 — Round 4: `WEBSITE_WORKSPACE.md`, README.md and `.env.example` updated, all claims re-verified against actual U1–U6 source. **All 7 units complete.**
-- [ ] Build and Test — **EXECUTE** (phase-level, now that all 7 units are complete)
+- [x] Build and Test — **EXECUTE** — Complete 2026-07-28. 609 unit tests (372 backend + 237 frontend), 0 vulnerable packages, 0 build errors. Plus live-host integration verification: static content/SPA-fallback/header-scoping, real master↔slave communication proving the persistent key ring survives a process restart, and W3C trace-id correlation in real log output. Artifacts in `construction/build-and-test/`
 
 ### OPERATIONS
 - [ ] Deployment Setup — **EXECUTE**
@@ -83,10 +83,10 @@ Execution rounds (Q4 = B): **R1** = U1 + U2 · **R2** = U3 + U4 · **R3** = U5 +
 - **Stages to Skip**: User Stories (no end-user functionality), NFR Requirements (already captured), plus per-unit skips as listed above
 
 ## Current Status
-- **Lifecycle Phase**: CONSTRUCTION
-- **Current Stage**: Round 4 **closed** 2026-07-28 — U7 complete and committed (`88770c5`). All 7 units of work are now generated
-- **Next Stage**: Build and Test (phase-level) — the last Construction stage before Operations
-- **Status**: Rounds 1–4 all done, nothing pushed. Starting Build and Test
+- **Lifecycle Phase**: OPERATIONS
+- **Current Stage**: Build and Test **complete** 2026-07-28 (all 7 units, full-suite + live-host integration verification). CONSTRUCTION phase is now closed
+- **Next Stage**: Deployment Setup (Operations Configuration = Yes, decided at Requirements Analysis)
+- **Status**: Rounds 1–4 all done, nothing pushed. Entering Operations phase
 
 ## Round 2 Design Record (2026-07-28)
 - Functional Design U3 + U4 complete and committed (`357d395`)