feat: Copilot CLI skill parity with Claude integration

[bilersan]

Summary

The Copilot CLI integration currently has only 5 skills while Claude has 40. This creates a significant feature gap for Copilot CLI users who don't get the same context-aware assistance.

Problem

Integration	Skills	Hooks	Governance
Claude	40	20+	Full
Copilot CLI	5	0	None

Proposed Solution

Port all 40 Claude skills to Copilot CLI format with:

• YAML frontmatter using tools: [bash, read, write, edit, glob, grep] array format (vs Claude's allowed-tools string)
• Lifecycle hook scripts (bash + PowerShell) for session-start/end and pre/post-tool-use
• Agent bootstrap instructions (INSTRUCTIONS.md)
• Hook configuration (ctx-hooks.json)

Skill Categories

Phase 1 - Core workflow: implement, commit, reflect, remember, wrap-up, brainstorm, spec
Phase 2 - Architecture & governance: architecture, consolidate, sanitize-permissions, prompt-audit, skill-audit, skill-creator
Phase 3 - Journal: journal-enrich, journal-enrich-all, journal-normalize
Phase 4 - Advanced: blog, blog-changelog, import-plans, loop, pause, resume, worktree
Phase 5 - Context management: add-convention, add-decision, add-learning, add-task, agent, archive, drift, prompt, recall, remind, status, verify, doctor
Internal: _ctx-alignment-audit

Infrastructure

• 8 hook scripts (4 lifecycle events x bash + PowerShell)
• INSTRUCTIONS.md agent bootstrap
• ctx-hooks.json hook configuration
• Updated embed.go for asset inclusion

Acceptance Criteria

• All 40 Claude skills have Copilot CLI equivalents
• Build passes with embedded assets
• Lint clean (go vet + golangci-lint)
• Compliance tests pass
• Naming aligned 1:1 with Claude skills