feat(doc-review, learnings-researcher): tiers, chain grouping, rewrite (#601)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

plugins/compound-engineering/AGENTS.md

@@ -216,6 +216,10 @@ Beta skills use a `-beta` suffix and `disable-model-invocation: true` to prevent
 
 When modifying a skill that has a `-beta` counterpart (or vice versa), always check the other version and **state your sync decision explicitly** before committing — e.g., "Propagated to beta — shared test guidance" or "Not propagating — this is the experimental delegate mode beta exists to test." Syncing to both, stable-only, and beta-only are all valid outcomes. The goal is deliberate reasoning, not a default rule.
 
+## Documented Solutions
+
+`docs/solutions/` holds documented solutions to past problems — bugs, architecture patterns, design patterns, tooling decisions, conventions, workflow practices, and other institutional knowledge. Entries use YAML frontmatter with fields including `module`, `tags`, and `problem_type`. Knowledge-track `problem_type` values are `architecture_pattern`, `design_pattern`, `tooling_decision`, `convention`, `workflow_issue`, `developer_experience`, `documentation_gap`, and `best_practice` (fallback). Bug-track values cover `build_error`, `test_failure`, `runtime_error`, `performance_issue`, `database_issue`, `security_issue`, `ui_bug`, `integration_issue`, and `logic_error`. Search this directory before designing new solutions so institutional memory compounds across changes.
+
 ## Documentation
 
 See `docs/solutions/plugin-versioning-requirements.md` for detailed versioning workflow.