docs: finalize domain-test-checklist + session log + roadmap (test safety net, 100% coverage)

docs/reference/domain-test-checklist.md

@@ -5,16 +5,17 @@ When you change a domain, its box must still hold (or you update this list on pu
 Baseline established 2026-07-22 (see plan `2026-07-22-per-domain-test-safety-net`).
 Tracked as Plane epic **SL-70**.
 
-## Coverage baseline (Phase A, 2026-07-22)
+## Coverage: baseline (Phase A) → final (Phase C), 2026-07-22
 
-| Workspace | % Stmts | % Branch | % Funcs | % Lines |
-| --------- | ------- | -------- | ------- | ------- |
-| api       | 96.94   | 74.29    | 100     | 96.94   |
-| worker    | 89.62   | 87.42    | 70.58   | 89.62   |
-| admin     | 92.43   | 84.91    | 78.75   | 92.43   |
+| Workspace | Stmts (before → after) | Branch (before → after) | Funcs (before → after) | Tests (before → after) |
+| --------- | ---------------------- | ----------------------- | ---------------------- | ---------------------- |
+| api       | 96.94 → **100**        | 74.29 → **100**         | 100 → **100**          | 103 → **175**          |
+| worker    | 89.62 → **100**        | 87.42 → **100**         | 70.58 → **100**        | 30 → **79**            |
+| admin     | 92.43 → **100**        | 84.91 → **100**         | 78.75 → **100**        | 50 → **129**           |
 
-Target after the sweep: near-100% per domain; remaining uncovered lines annotated
-`/* c8 ignore next -- <reason> */`, not left silent.
+All three workspaces reach **100%** statements/branches/functions/lines. Genuinely
+unreachable/defensive lines are annotated `/* c8 ignore next -- <reason> */` (never left silent).
+No bugs were found during the sweep — every added test locks in already-correct behavior.
 
 <!-- Phase B appends one "## <domain>" section per domain below. -->