Merge PR #12: refresh REV004 final summary docs-main anchor\n\nConstraint: Keep the final summary internally consistent with current docs mainline\nConfidence: high\nScope-risk: narrow\nDirective: Refresh summary metadata immediately after future summary merges so the handoff page never self-stales\nTested: PR #12 content cross-checked against docs main ab4eec0...\nNot-tested: No document export/render pipeline executed at merge time

This updates the docs-main latest merge anchor inside the REV004 final mainline
summary so the document remains self-consistent after its own merge.

Constraint: The final summary must reference the current docs mainline state, not the pre-summary merge anchor
Rejected: Leave the older docs merge SHA in place | would make the summary internally stale immediately after merge
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Refresh top-level summary anchors whenever the summary itself is merged into main
Tested: Cross-checked against origin/main latest merge ab4eec0...
Not-tested: No document export/render pipeline executed for this one-line metadata refresh

docs/guides/REV004_FINAL_MAINLINE_DELIVERY_SUMMARY.md

@@ -9,7 +9,7 @@
 ### docs
 - repo：`tangweijie/fujian_water_biz_doc`
 - branch：`main`
-- latest merge：`415b4cee1303f51c7a3aeb0a58722873e852452c`
+- latest merge：`ab4eec0ea8dfeca49f7a4b913a53f73616f59f71`
 
 ---