refactor: extract inline PostToolUse hooks into external scripts

Move three complex inline hooks from hooks.json into proper external
scripts in scripts/hooks/:

- post-edit-format.js: Prettier auto-formatting (was 1 minified line)
- post-edit-typecheck.js: TypeScript check (was 1 minified line with
  unbounded directory traversal, now capped at 20 levels)
- post-edit-console-warn.js: console.log warnings (was 1 minified line)

Benefits:
- Readable, documented, and properly error-handled
- Testable independently via stdin
- Consistent with other hooks (all use external scripts now)
- Adds timeouts to Prettier (15s) and tsc (30s) to prevent hangs

hooks/hooks.json

@@ -105,7 +105,7 @@
         "hooks": [
           {
             "type": "command",
-            "command": "node -e \"const{execFileSync}=require('child_process');const fs=require('fs');let d='';process.stdin.on('data',c=>d+=c);process.stdin.on('end',()=>{const i=JSON.parse(d);const p=i.tool_input?.file_path;if(p&&/\\.(ts|tsx|js|jsx)$/.test(p)&&fs.existsSync(p)){try{execFileSync('npx',['prettier','--write',p],{stdio:['pipe','pipe','pipe']})}catch(e){}}console.log(d)})\""
+            "command": "node \"${CLAUDE_PLUGIN_ROOT}/scripts/hooks/post-edit-format.js\""
           }
         ],
         "description": "Auto-format JS/TS files with Prettier after edits"
@@ -115,7 +115,7 @@
         "hooks": [
           {
             "type": "command",
-            "command": "node -e \"const{execFileSync}=require('child_process');const fs=require('fs');const path=require('path');let d='';process.stdin.on('data',c=>d+=c);process.stdin.on('end',()=>{const i=JSON.parse(d);const p=i.tool_input?.file_path;if(p&&/\\.(ts|tsx)$/.test(p)&&fs.existsSync(p)){let dir=path.dirname(p);while(dir!==path.dirname(dir)&&!fs.existsSync(path.join(dir,'tsconfig.json'))){dir=path.dirname(dir)}if(fs.existsSync(path.join(dir,'tsconfig.json'))){try{const r=execFileSync('npx',['tsc','--noEmit','--pretty','false'],{cwd:dir,encoding:'utf8',stdio:['pipe','pipe','pipe']});const lines=r.split('\\n').filter(l=>l.includes(p)).slice(0,10);if(lines.length)console.error(lines.join('\\n'))}catch(e){const lines=(e.stdout||'').split('\\n').filter(l=>l.includes(p)).slice(0,10);if(lines.length)console.error(lines.join('\\n'))}}}console.log(d)})\""
+            "command": "node \"${CLAUDE_PLUGIN_ROOT}/scripts/hooks/post-edit-typecheck.js\""
           }
         ],
         "description": "TypeScript check after editing .ts/.tsx files"
@@ -125,7 +125,7 @@
         "hooks": [
           {
             "type": "command",
-            "command": "node -e \"const fs=require('fs');let d='';process.stdin.on('data',c=>d+=c);process.stdin.on('end',()=>{const i=JSON.parse(d);const p=i.tool_input?.file_path;if(p&&/\\.(ts|tsx|js|jsx)$/.test(p)&&fs.existsSync(p)){const c=fs.readFileSync(p,'utf8');const lines=c.split('\\n');const matches=[];lines.forEach((l,idx)=>{if(/console\\.log/.test(l))matches.push((idx+1)+': '+l.trim())});if(matches.length){console.error('[Hook] WARNING: console.log found in '+p);matches.slice(0,5).forEach(m=>console.error(m));console.error('[Hook] Remove console.log before committing')}}console.log(d)})\""
+            "command": "node \"${CLAUDE_PLUGIN_ROOT}/scripts/hooks/post-edit-console-warn.js\""
           }
         ],
         "description": "Warn about console.log statements after edits"