docs: close sprint 14 issue #123 and mark execution complete

Author: echowang1

docs/spec/execution-ledger.md

@@ -4,8 +4,8 @@ Use this file as the progress ledger during delivery.
 
 ## Snapshot
 - Last updated: 2026-02-23
-- Current phase: Sprint 14 execution start
-- Current sprint: Sprint 14 (in progress)
+- Current phase: Sprint 14 execution complete
+- Current sprint: Sprint 14 (completed, release closeout pending)
 - Overall status: in_progress
 
 ## Milestones
@@ -49,6 +49,7 @@ Use this file as the progress ledger during delivery.
 | M35 | Sprint 13 release closeout | done | Eng | 2026-02-23 | `develop` merged to `main`, tag `v0.13.0-sprint13` created |
 | M36 | Sprint 14 planning kickoff | done | Eng | 2026-02-23 | Sprint 14 planning pack prepared; issue drafts ready for creation |
 | M37 | Sprint 14 execution start | done | Eng | 2026-02-23 | Issues #116-#123 created and assigned; #116 in progress |
+| M38 | Sprint 14 execution complete | done | Eng | 2026-02-23 | Issues #116-#123 completed and validated; ready for release closeout |
 
 ## Decision Log
 | Date | Decision | Owner | Rationale |
@@ -66,8 +67,8 @@ Use this file as the progress ledger during delivery.
 | Tooling positioning | done | Keep adapter contracts aligned |
 | Master roadmap | done | Phase 13 completed; Phase 14 planned |
 | Executable task list | done | Sprint 14 tasks EN-043..QA-011 added |
-| Sprint backlog | done | Sprint 14 issues #116-#122 completed; #123 in progress |
-| Engineering implementation | done | Frontend parity drift alert API delivered for #122 |
+| Sprint backlog | done | Sprint 14 issues #116-#123 completed; execution scope finished |
+| Engineering implementation | done | Sprint 14 integrated merge-rehearsal validation delivered for #123 |
 
 ## Change Log (execution)
 | Date | Change | Commit / Link |
@@ -329,3 +330,5 @@ Use this file as the progress ledger during delivery.
 | 2026-02-23 | Add web-v2 merge incident runbook v1 with SEV matrix and rollback checkpoints (#121) | `d4435f9` |
 | 2026-02-23 | Close #121 and move #122 to in progress | GitHub issue state updated |
 | 2026-02-23 | Implement frontend parity drift alert API with emit/list/ack and snapshot-triggered alerts (#122) | `4b397d4` |
+| 2026-02-23 | Close #122 and move #123 to in progress | GitHub issue state updated |
+| 2026-02-23 | Add Sprint 14 integrated merge-rehearsal validation test (#123) | `552f1ef` |

docs/sprints/sprint-14-issue-index.md

@@ -1,8 +1,8 @@
 # Sprint 14 Issue Index
 
 ## Status Snapshot (2026-02-23)
-- Closed: #116, #117, #118, #119, #120, #121, #122
-- In progress: #123
+- Closed: #116, #117, #118, #119, #120, #121, #122, #123
+- In progress: (none)
 - Todo: (none)
 
 ## Issue Links
@@ -16,4 +16,4 @@
 123. [#123 [QA] Sprint 14 integrated merge-rehearsal validation](https://github.com/demshine/cineweave-platform/issues/123)
 
 ## Next Task
-- Execute #123 and close Sprint 14 execution scope.
+- Prepare Sprint 14 release closeout and merge.