[2.26.1] Improve best-practices-researcher to check skills first

- Add Phase 1: Discover and read relevant SKILL.md files before going online
- Add skill mappings for common technologies (Rails, Frontend, AI, etc.)
- Only proceed to online research if skills don't provide enough coverage
- Prioritize skill-based guidance with clear source attribution
- Synthesize findings from skills + online sources

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

plugins/compound-engineering/CHANGELOG.md

@@ -5,6 +5,19 @@ All notable changes to the compound-engineering plugin will be documented in thi
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2.26.1] - 2026-01-14
+
+### Changed
+
+- **`best-practices-researcher` agent** - Now checks skills before going online
+  - Phase 1: Discovers and reads relevant SKILL.md files from plugin, global, and project directories
+  - Phase 2: Only goes online for additional best practices if skills don't provide enough coverage
+  - Phase 3: Synthesizes all findings with clear source attribution (skill-based > official docs > community)
+  - Skill mappings: Rails → dhh-rails-style, Frontend → frontend-design, AI → agent-native-architecture, etc.
+  - Prioritizes curated skill knowledge over external sources for trivial/common patterns
+
+---
+
 ## [2.26.0] - 2026-01-14
 
 ### Added