feat(plugin): event hooks for auto-intervention (PreToolUse, SessionStart, PreCommit)

[JeremyDev87]

Purpose

Intercept Claude Code events to enforce codingbuddy rules automatically — no more relying on Claude to voluntarily call MCP tools.

Changes

• packages/codingbuddy-plugin/ — New plugin package
• Hooks: SessionStart (auto-load config), PreToolUse (inject checklist), PostToolUse (track results), PreCommit (enforce quality gates)

Key Use Cases

• SessionStart → auto-load codingbuddy.config.json, inject rules
• PreToolUse(Bash, git commit) → enforce lint/test before commit
• EVAL mode → auto-dispatch specialists (solve 0% dispatch rate)

Acceptance Criteria

• Plugin scaffolded with Claude Code plugin API
• SessionStart hook loads codingbuddy config
• PreToolUse hook can inject context/instructions
• PostToolUse hook tracks tool usage for statistics
• Hooks configurable via codingbuddy.config.json