fix: Replace Unix shell commands with cross-platform Node.js equivalents

[unRekable]

Summary

This PR provides 1:1 equivalent Node.js implementations for all Unix-only shell commands in settings.json, ensuring identical behavior on Windows.

New Cross-Platform Hooks

1. bin/hooks/typecheck-limiter.js

Equivalent to: npx tsc --noEmit 2>&1 | head -5 || true

Bash Feature	Node.js Equivalent
tsc --noEmit	spawn(tsc, ['--noEmit'])
head -5	Line counter, stop at 5 lines
|| true	process.exit(0) always
Finds tsc	Checks node_modules/.bin/tsc first

2. bin/hooks/similar-doc-detector.js

Equivalent to: The complex bash find/grep/sed command

Bash Feature	Node.js Equivalent
find . -name '*.md'	Recursive fs.readdirSync()
-not -path './node_modules/*'	Skip node_modules in loop
-not -path './.git/*'	Skip .git in loop
basename '$FILE'	path.basename(filePath)
sed 's/_/ /g'	.replace(/_/g, ' ')
sed 's/.md$//'	.replace(/\.mdx?$/, '')
head -c 30	.substring(0, 30)
xargs grep -l	fs.readFileSync() + includes()
grep -v "$FILE"	Skip if same file
head -1	break after first match
$FILE from env	stdin JSON tool_input.file_path

3. bin/hooks/phase-tracker.js

Equivalent to: if [ -f .agentful/state.json ]; then jq -r '.current_phase // "idle"' .agentful/state.json 2>/dev/null || echo 'idle'; else echo 'idle'; fi

Bash Feature	Node.js Equivalent
[ -f ... ]	fs.existsSync()
jq -r '.current_phase'	JSON.parse().current_phase
// "idle"	|| 'idle'
2>/dev/null	try/catch block

Technical Details

All hooks:

• Read input from stdin as per Claude Code hook standard (tool_input.file_path)
• Exit 0 for informational output (non-blocking)
• Work on Windows, macOS, and Linux - no shell-specific commands
• No external dependencies - pure Node.js standard library

Testing

# Test typecheck-limiter.js
node bin/hooks/typecheck-limiter.js
# Output: First 5 TypeScript errors (if any)
# Exit: 0

# Test similar-doc-detector.js  
echo '{"tool_input":{"file_path":"README.md"}}' | node bin/hooks/similar-doc-detector.js
# Output: ⚠️ Similar doc exists: path/to/similar.md
# Exit: 0

# Test phase-tracker.js
node bin/hooks/phase-tracker.js
# Exit: 0

Files Changed

• bin/hooks/typecheck-limiter.js (new) - TypeScript check with output limiting
• bin/hooks/similar-doc-detector.js (new) - Detect similar markdown docs
• bin/hooks/phase-tracker.js (updated) - Track agentful phase
• template/.claude/settings.json - Use new Node.js hooks instead of shell commands