docs(ops): pin T20 hardening head SHA and commit list

Record local tip and four implementation commits for handoff.

.doc/ops/short-term/2026-09-22-t20-lowrisk-hardening.md

@@ -23,7 +23,7 @@ write_scope:
   - web/src/
   - .doc/ops/short-term/2026-09-22-t20-lowrisk-hardening.md
 allowed_environments: []
-head_sha: ""
+head_sha: "6de09a1a96866eeaf1a1a5bce3039b9ea2431c86"
 mutex: "t20-lowrisk-hardening + web"
 review_state: pending
 integration_state: pending
@@ -88,8 +88,12 @@ remote_sync: not_requested
 
 ## 收口与交接
 
-- 剩余工作：待独立集成认领合入 `dev`；不 push。
-- 本地提交见下方 SHA；`integration_state=pending`；`deployment=not_required`；`remote_sync=not_requested`。
+- 本地提交（未 push）：
+  - `f12e2ed15524e700973c8493aec265ab50842f55` fix: reclaim cancelFns…
+  - `0c4baad4a2576369a558c82477abbdb89c8f9245` fix(infra): align ready health…
+  - `472ec6497f2fa426bafd26566f19fb484689cabd` fix(web): plan-card catch…
+  - `6de09a1a96866eeaf1a1a5bce3039b9ea2431c86` docs(ops): record T20…
+- `integration_state=pending`；`deployment=not_required`；`remote_sync=not_requested`。
 - cleanup：合入并确认 tip 为 `origin/dev` 祖先后由独立维护者复查 remove。
 
 ## 相关链接