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.

docs/technical/process/README.md

@@ -8,7 +8,7 @@ Use these artefacts to understand team ownership, active workstreams, and histor
 
 ## Work Tracking
 - [../TASKS.md](../../TASKS.md) – Docs Guild task board.
-- Sprint plans and historical boards: [../implplan/SPRINTS.md](../../implplan/SPRINTS.md), [../implplan/SPRINTS_PRIOR_20251028.md](../../implplan/SPRINTS_PRIOR_20251028.md), [../implplan/SPRINTS_PRIOR_20251027.md](../../implplan/SPRINTS_PRIOR_20251027.md), [../implplan/SPRINTS_PRIOR_20251025.md](../../implplan/SPRINTS_PRIOR_20251025.md), [../implplan/SPRINTS_PRIOR_20251021.md](../../implplan/SPRINTS_PRIOR_20251021.md), [../implplan/SPRINTS_PRIOR_20251019.md](../../implplan/SPRINTS_PRIOR_20251019.md).
+- Sprint plans and historical boards: [../implplan/SPRINTS.md](`/docs/implplan/SPRINT_*.md`), [../implplan/SPRINTS_PRIOR_20251028.md](../../implplan/SPRINTS_PRIOR_20251028.md), [../implplan/SPRINTS_PRIOR_20251027.md](../../implplan/SPRINTS_PRIOR_20251027.md), [../implplan/SPRINTS_PRIOR_20251025.md](../../implplan/SPRINTS_PRIOR_20251025.md), [../implplan/SPRINTS_PRIOR_20251021.md](../../implplan/SPRINTS_PRIOR_20251021.md), [../implplan/SPRINTS_PRIOR_20251019.md](../../implplan/SPRINTS_PRIOR_20251019.md).
 - Backlog hygiene and consolidation notes: [../backlog/](../../backlog/).
 - Task packs and reusable templates: [../task-packs/](../../task-packs/).