Record 8D.8–8D.10 target sign-off

Document user-supplied telemetry, functional testing, and acceptance of
the implemented Serial and account settings scope.

docs/agent/current-state.md

@@ -4,6 +4,10 @@ This file is working memory. Update it during active work and before handoff; do
 
 ## Development state
 
+- **8D.8–8D.10 implemented scope signed off by user (2026-09-08):** User provides settled boot/full-mix telemetry and reports thorough Serial parameter display/settings and user/account testing: “Implemented work can be signed off.” Accepts 8D.8, 8D.9 including UX refinement, and both implemented 8D.10 slices, superseding pending-signoff/target-blocker statements below without inventing individual checklist passes. Current source/handoff confirms credential/self workflows and generated route complete. Exact flashed revision/browser/durations/reboot/fault-injection details not separately supplied. Full mix at **230400 8N1 RTS/CTS, DTR active**: SSH writer8, USB observer9, web observers26/11, SSH admin and web admin, two cookie sessions; no broker drop counters supplied. Boot internal/DMA/PSRAM free **69,928/62,172/8,246,368 B**, loaded final **32,556/24,800/8,087,656 B**, loaded minima **19,228/11,472/8,065,444 B**, largest **23,552/23,552/7,995,392 B**. SSH minimum-free stack **18,476 boot / 16,284 loaded B**. One SSH handshake failure/broker revocation, one WebSocket send failure/close and one invalid login retained without diagnosis. All six loaded samples, counters, scope and evidence limits: `docs/phase8d10_implementation.md`. Numeric reserves, HTTPD/dispatcher stack margins, cleanup/soak evidence and earlier accepted admission issue remain followups, not reopening sign-off. Browser-shell restrictions/UART0 recovery and M2 stand; no full M3 claim. **Wait for separately requested 8D.11.** This update documentation-only, no new build/test/device/source/config/asset/commit action; preserve existing user `platformio.ini` edit.
+
+The following implementation entries predate target sign-off and retain historical build/test attribution; their target-pending status is superseded above.
+
 - **Current 8D.10 slice 2 complete, host-tested/build-verified (2026-09-08); target/signoff pending, not target accepted:** Create/password/generated-value/self workflows use the existing dispatcher slot, 768-byte/four-receive admission and canonical mutation-lock identity checks. One-second periodic timer cancels/wipes non-executing credentials at 30 seconds plus scheduling latency; admitted work is not cancelled and locals wipe after return. Generation is separate before commit, with no retained retrieval; UI 60-second lifetime/context-bound acknowledgement and best-effort secret clearing. Immediate self revocation can lose POST/results: 401/disconnect is uncertain, inspect after relogin before retry. Browser-shell restrictions unchanged. Review's only finding, missing generated-route registration, is fixed as an independent optional endpoint with failure isolation/restart coverage: **23 handlers**, six sockets/no LRU unchanged. Parent PASS canonical `accounts.py`, boundary `run.py`, parser **294**, cookie `--accounts` **9 plus shared**, `--serial-settings` **10**, transport **25**/tickets **12**, store `--serial` and diff check. UI agent **57 plus CSP** (four added beyond 53); route agent lifecycle **15** pass. These UI/lifecycle results are agent-attributed, not claims of the parent's additional reruns. Parent `pio run` **PASS 25.61 s, 95,908 B RAM / 1,694,237 B flash**, **+80/+9,880** vs slice 1 and **+200/+25,400** vs final 8D.9 UX. New timer runtime costs, heap reserves and stack margins remain unmeasured/unapproved. Record/checklist: `docs/phase8d10_implementation.md`; slice 1 below remains historical. This update is documentation-only; no source/test/build action by this documentation agent. No sanitizer validation, device/assets/commit/8D.11 action, full 8D.10 target signoff or prior-phase signoff/reserve approval inferred.
 
 The following slice 1 entry is explicit historical evidence; its unavailable/next-slice statements and build/counts do not describe current slice 2.