chore(release): prepare v5.1.0 release with 21 new features

[JeremyDev87]

Summary

v5.0.0 이후 머지된 모든 변경사항을 v5.1.0으로 릴리즈한다.

Included Changes (v5.0.0 → v5.1.0)

Impact Telemetry (NEW - Headline Feature)

• feat(mcp): add ImpactModule with event types, services, and tests #1061 feat(mcp): add ImpactModule with event types, services, and tests
• feat(mcp): add get_session_impact MCP tool #1062 feat(mcp): add get_session_impact MCP tool
• feat(mcp): add impact event logging to existing MCP handlers #1063 feat(mcp): add impact event logging to existing MCP handlers
• feat(plugin): render session impact report in stop hook #1064 feat(plugin): render session impact report in stop hook

Plugin Wow Experience (13 features)

• feat(plugin): buddy greeting with typing animation
• feat(plugin): agent handoff animation on agent switch
• feat(plugin): session summary with mini bar chart
• feat(plugin): one-line session summary on stop hook
• feat(plugin): first-run interactive onboarding tour
• feat(plugin): /buddy command for on-demand interaction
• feat(plugin): TDD cycle mini progress bar in PreToolUse
• feat(plugin): achievement and badge system for coding habits
• feat(plugin): ASCII fallback mode for buddy character rendering
• feat(plugin): adaptive performance mode for hooks
• fix(plugin): reduce PreToolUse information overload with priority-based display
• fix(plugin): batch achievement notifications to prevent text wall
• fix: remove automatic TUI launch from session hooks (fix(plugin): disable automatic TUI launch to reduce memory usage in multi-session #1066)

MCP Server Enhancements (5)

• feat(mcp): context history archive for cross-session decision tracking
• feat(mcp): diff-based agent recommendation
• feat(mcp): rule effectiveness insights tool
• feat(mcp): visual data in parse_mode response
• feat(agents): visual character system for agent definitions

taskMaestro Improvements (3)

• feat(taskmaestro): add conductor-driven code review cycle before completion #1053 feat(taskmaestro): conductor-driven code review cycle
• feat(taskmaestro): add dedicated review agent pane for PR quality gate #1067 feat(taskmaestro): dedicated review agent pane for PR quality gate
• fix(taskmaestro): add yarn install to pre-flight and mandatory pre-push verification #1032 fix(taskmaestro): pre-flight yarn install + mandatory pre-push verification

Built-in Skills (4)

• feat(skills): /ship — local CI checks and PR creation
• feat(skills): /plan-to-issues — convert plans to GitHub issues
• feat(skills): /onboard — new project setup wizard
• feat(skills): /retrospective — session review and insights

i18n & Platform Support (3)

• feat(i18n): expand to PT-BR, DE, FR (now 8 languages)
• feat(adapters): Windsurf and Aider integration guides
• feat(rules): adapter auto-sync mechanism (yarn sync-rules)

CI/Infrastructure (4)

• feat(ci): E2E test pipeline for plugin hooks
• ci(marketplace): post-deploy URL verification
• ci(marketplace): workflow self-trigger for deployment changes
• fix(ship): run security checks for all workspaces regardless of affected paths #979 fix(ship): run security checks for all workspaces

Bug Fixes (5)

• Bug: Unquoted path in UserPromptSubmit HOOK_COMMAND (session-start.py) #993 fix(plugin): quote HOOK_COMMAND path for spaces in home directory
• fix(plugin): use substring match in _is_hook_in_settings for backward compat
• fix(plugin): session ID fallback when env var missing
• fix(scripts): add marketplace.json to bump-version.sh
• fix(plugin): quote CLAUDE_PLUGIN_ROOT in hook commands for paths with spaces

Release Tasks

• Update chore(release): prepare v5.1.0 release with 21 new features #1031 issue body with accurate changelog ✅
• Run scripts/bump-version.sh 5.1.0
• Update CHANGELOG.md
• Verify all CI passes on master
• Tag v5.1.0
• Publish to npm
• Create GitHub Release with changelog
• README update (see docs: revamp README for v5.1.0 with marketing focus and new architecture #1073)
• Landing page update (see feat(landing): redesign landing page for v5.5.0 with Impact Telemetry showcase #1074, post-release)