perf(intel): simplify SessionStart hook + gitignore intel/

- SessionStart now reads pre-generated summary.md directly
- No more JSON parsing of potentially large index.json
- Added guidance: .planning/intel/ should always be gitignored
  (changes constantly, can be regenerated with /gsd:analyze-codebase)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

commands/gsd/new-project.md

@@ -353,6 +353,9 @@ Create `.planning/config.json` with all settings:
 - Set `commit_docs: false` in config.json
 - Add `.planning/` to `.gitignore` (create if needed)
 
+**If commit_docs = Yes:**
+- Add `.planning/intel/` to `.gitignore` (intel is always local — changes constantly, can be regenerated)
+
 **Commit config.json:**
 
 ```bash

hooks/gsd-intel-session.js

@@ -1,71 +1,10 @@
 #!/usr/bin/env node
 // Codebase Intelligence - SessionStart Context Injection Hook
-// Injects codebase summary into Claude's context at session start
+// Reads pre-generated summary.md and injects into Claude's context
 
 const fs = require('fs');
 const path = require('path');
 
-/**
- * Generate concise codebase summary for context injection
- * Target: < 500 tokens to minimize context usage
- */
-function generateSummary(index, conventions) {
-  const lines = [];
-
-  // File count
-  const fileCount = Object.keys(index.files || {}).length;
-  if (fileCount === 0) return null;
-
-  lines.push(`Indexed files: ${fileCount}`);
-
-  // Naming conventions (if detected with confidence)
-  if (conventions.naming?.exports?.dominant) {
-    const n = conventions.naming.exports;
-    lines.push(`Export naming: ${n.dominant} (${n.percentage}%)`);
-  }
-
-  // Key directories (top 5)
-  const dirs = Object.entries(conventions.directories || {});
-  if (dirs.length > 0) {
-    lines.push('');
-    lines.push('Key directories:');
-    for (const [dir, info] of dirs.slice(0, 5)) {
-      lines.push(`  ${dir}: ${info.purpose} (${info.files} files)`);
-    }
-  }
-
-  // Suffix patterns (top 3)
-  const suffixes = Object.entries(conventions.suffixes || {});
-  if (suffixes.length > 0) {
-    lines.push('');
-    lines.push('File patterns:');
-    for (const [suffix, info] of suffixes.slice(0, 3)) {
-      lines.push(`  ${suffix}: ${info.purpose} (${info.count} files)`);
-    }
-  }
-
-  // Key exports overview (categorize if enough data)
-  const allExports = [];
-  for (const [filePath, fileData] of Object.entries(index.files || {})) {
-    for (const exp of fileData.exports || []) {
-      if (exp !== 'default') {
-        allExports.push(exp);
-      }
-    }
-  }
-
-  if (allExports.length > 0) {
-    lines.push('');
-    lines.push(`Total exports: ${allExports.length}`);
-    // List a few example exports if available
-    if (allExports.length <= 10) {
-      lines.push(`Exports: ${allExports.join(', ')}`);
-    }
-  }
-
-  return lines.join('\n');
-}
-
 // Read JSON from stdin (standard hook pattern)
 let input = '';
 process.stdin.setEncoding('utf8');
@@ -79,25 +18,15 @@ process.stdin.on('end', () => {
       process.exit(0);
     }
 
-    // Check for intel files
-    const intelDir = path.join(process.cwd(), '.planning', 'intel');
-    const indexPath = path.join(intelDir, 'index.json');
+    // Read pre-generated summary (created by gsd-intel-index.js)
+    const summaryPath = path.join(process.cwd(), '.planning', 'intel', 'summary.md');
 
-    if (!fs.existsSync(indexPath)) {
+    if (!fs.existsSync(summaryPath)) {
       process.exit(0);  // No intel, skip silently
     }
 
-    // Read intel files
-    const index = JSON.parse(fs.readFileSync(indexPath, 'utf8'));
+    const summary = fs.readFileSync(summaryPath, 'utf8').trim();
 
-    let conventions = { naming: {}, directories: {}, suffixes: {} };
-    const conventionsPath = path.join(intelDir, 'conventions.json');
-    if (fs.existsSync(conventionsPath)) {
-      conventions = JSON.parse(fs.readFileSync(conventionsPath, 'utf8'));
-    }
-
-    // Generate and output summary
-    const summary = generateSummary(index, conventions);
     if (summary) {
       process.stdout.write(`<codebase-intelligence>\n${summary}\n</codebase-intelligence>`);
     }