feat: PreToolUse hook for CLI-first multi-tool support

[pszymkowiak]

Summary

• New icm-pretool.sh PreToolUse hook: auto-allows icm CLI commands in Claude Code (no permission prompts)
• icm init --mode hook now installs both PreToolUse (auto-allow) + PostToolUse (auto-extract)
• Updated skill/CLI instructions to prefer CLI over MCP
• Enhanced CLAUDE.md template with full command reference (store, recall, update, health, feedback)

Why

The MCP server is fragile across tools. CLI is universal — works with claude, codex, gemini, vibe, opencode, wshm, and any tool that can run bash. The PreToolUse hook makes CLI usage seamless (no permission prompts), just like RTK does for token savings.

Architecture

AI Tool (any) → runs `icm store/recall/...` via bash
                       ↓
PreToolUse hook fires → detects `icm` command → auto-allow
                       ↓
Command executes without permission prompt
                       ↓
PostToolUse hook fires → auto-extracts context every 15 calls

Test plan

• icm init --mode hook installs both hooks in settings.json
• icm commands auto-allowed (no permission prompt in Claude Code)
• PostToolUse auto-extraction still works
• Non-icm commands unaffected