feat: Add hookify plugin for custom hook rules via markdown

Adds the hookify plugin to public marketplace. Enables users to create custom
hooks using simple markdown configuration files instead of editing JSON.

Key features:
- Define rules with regex patterns to warn/block operations
- Create rules from explicit instructions or conversation analysis
- Pattern-based matching for bash commands, file edits, prompts, stop events
- Enable/disable rules dynamically without editing code
- Conversation analyzer agent finds problematic behaviors

Changes from internal version:
- Removed non-functional SessionStart hook (not registered in hooks.json)
- Removed all sessionstart documentation and examples
- Fixed restart documentation to consistently state "no restart needed"
- Changed license from "Internal Anthropic use only" to "MIT License"
- Kept test blocks in core modules (useful for developers)

Plugin provides:
- 4 commands: /hookify, /hookify:list, /hookify:configure, /hookify:help
- 1 agent: conversation-analyzer
- 1 skill: writing-rules
- 4 hook types: PreToolUse, PostToolUse, Stop, UserPromptSubmit
- 4 example rules ready to use

All features functional and suitable for public use.

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

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

plugins/hookify/commands/list.md

@@ -0,0 +1,82 @@
+---
+description: List all configured hookify rules
+allowed-tools: ["Glob", "Read", "Skill"]
+---
+
+# List Hookify Rules
+
+**Load hookify:writing-rules skill first** to understand rule format.
+
+Show all configured hookify rules in the project.
+
+## Steps
+
+1. Use Glob tool to find all hookify rule files:
+   ```
+   pattern: ".claude/hookify.*.local.md"
+   ```
+
+2. For each file found:
+   - Use Read tool to read the file
+   - Extract frontmatter fields: name, enabled, event, pattern
+   - Extract message preview (first 100 chars)
+
+3. Present results in a table:
+
+```
+## Configured Hookify Rules
+
+| Name | Enabled | Event | Pattern | File |
+|------|---------|-------|---------|------|
+| warn-dangerous-rm | ✅ Yes | bash | rm\s+-rf | hookify.dangerous-rm.local.md |
+| warn-console-log | ✅ Yes | file | console\.log\( | hookify.console-log.local.md |
+| check-tests | ❌ No | stop | .* | hookify.require-tests.local.md |
+
+**Total**: 3 rules (2 enabled, 1 disabled)
+```
+
+4. For each rule, show a brief preview:
+```
+### warn-dangerous-rm
+**Event**: bash
+**Pattern**: `rm\s+-rf`
+**Message**: "⚠️ **Dangerous rm command detected!** This command could delete..."
+
+**Status**: ✅ Active
+**File**: .claude/hookify.dangerous-rm.local.md
+```
+
+5. Add helpful footer:
+```
+---
+
+To modify a rule: Edit the .local.md file directly
+To disable a rule: Set `enabled: false` in frontmatter
+To enable a rule: Set `enabled: true` in frontmatter
+To delete a rule: Remove the .local.md file
+To create a rule: Use `/hookify` command
+
+**Remember**: Changes take effect immediately - no restart needed
+```
+
+## If No Rules Found
+
+If no hookify rules exist:
+
+```
+## No Hookify Rules Configured
+
+You haven't created any hookify rules yet.
+
+To get started:
+1. Use `/hookify` to analyze conversation and create rules
+2. Or manually create `.claude/hookify.my-rule.local.md` files
+3. See `/hookify:help` for documentation
+
+Example:
+```
+/hookify Warn me when I use console.log
+```
+
+Check `${CLAUDE_PLUGIN_ROOT}/examples/` for example rule files.
+```