Update AGENTS.md files across multiple modules to standardize task status update instructions and introduce a new document for Secret Leak Detection operations.

- Modified task status update instructions in AGENTS.md files to refer to corresponding sprint files as `/docs/implplan/SPRINT_*.md` instead of `docs/implplan/SPRINTS.md`.
- Added a comprehensive document for Secret Leak Detection operations detailing scope, prerequisites, rule bundle lifecycle, enabling the analyzer, policy patterns, observability, troubleshooting, and references.

src/Concelier/__Libraries/StellaOps.Concelier.Normalization/AGENTS.md

@@ -17,11 +17,11 @@ Maintain helper utilities that normalise upstream advisory payloads into Conceli
 - `docs/modules/concelier/design/` materials if referenced by tasks.
 
 ## Working Agreement
-1. **Synchronise status** in both `docs/implplan/SPRINTS.md` and `TASKS.md` when starting/finishing tasks.
+1. **Synchronise status** in both corresponding sprint file `docs/implplan/SPRINT_*.md` and `TASKS.md` when starting/finishing tasks.
 2. **AOC compliance**: avoid adding severity, consensus, fix hints, or other derived fields—output raw upstream data plus provenance.
 3. **Deterministic outputs**: enforce stable ordering (sorted arrays/objects), UTC timestamps, lowercase enum values as documented.
 4. **Shared API stability**: version helpers when breaking changes are needed; communicate with connector guilds.
 5. **Testing**: extend golden fixtures & property tests to catch regressions; ensure CI covers multi-source scenarios.
 6. **Documentation**: update developer notes (add/refresh doc under `docs/modules/concelier`) when normalization contracts change.
 
-- 1. Update task status to `DOING`/`DONE` in both `docs/implplan/SPRINTS.md` and the local `TASKS.md` when you start or finish work.
+- 1. Update task status to `DOING`/`DONE` in both correspoding sprint file `/docs/implplan/SPRINT_*.md` and the local `TASKS.md` when you start or finish work.