revert: remove codebase intelligence system

Rolled back the intel system due to overengineering concerns:
- 1200+ line hook with SQLite graph database
- 21MB sql.js dependency
- Entity generation spawning additional Claude calls
- Complex system with unclear value

Removed:
- /gsd:analyze-codebase command
- /gsd:query-intel command
- gsd-intel-index.js, gsd-intel-session.js, gsd-intel-prune.js hooks
- gsd-entity-generator, gsd-indexer agents
- entity.md template
- sql.js dependency

Preserved:
- Model profiles feature
- Statusline hook
- All other v1.9.x improvements

-3,065 lines removed

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

hooks/gsd-intel-prune.js

@@ -1,78 +0,0 @@
-#!/usr/bin/env node
-
-/**
- * Intel Prune Hook (Stop event)
- *
- * Removes stale entries from index.json when files no longer exist.
- * Runs after each Claude response to keep intel fresh.
- *
- * Fast: Only does fs.existsSync checks, no file reading.
- * Silent: Never blocks or errors, always exits 0.
- */
-
-const fs = require('fs');
-const path = require('path');
-
-function pruneIndex() {
-  const intelDir = path.join(process.cwd(), '.planning', 'intel');
-  const indexPath = path.join(intelDir, 'index.json');
-
-  // Only run if intel directory exists (opt-in check)
-  if (!fs.existsSync(intelDir)) {
-    return { pruned: 0, total: 0 };
-  }
-
-  // Read existing index
-  let index;
-  try {
-    const content = fs.readFileSync(indexPath, 'utf8');
-    index = JSON.parse(content);
-  } catch (e) {
-    // No index or invalid JSON
-    return { pruned: 0, total: 0 };
-  }
-
-  if (!index.files || typeof index.files !== 'object') {
-    return { pruned: 0, total: 0 };
-  }
-
-  // Check each file and collect deleted ones
-  const filePaths = Object.keys(index.files);
-  const deleted = filePaths.filter(filePath => !fs.existsSync(filePath));
-
-  if (deleted.length === 0) {
-    return { pruned: 0, total: filePaths.length };
-  }
-
-  // Remove deleted entries
-  for (const filePath of deleted) {
-    delete index.files[filePath];
-  }
-  index.updated = Date.now();
-
-  // Write updated index
-  fs.writeFileSync(indexPath, JSON.stringify(index, null, 2));
-
-  // Regenerate conventions and summary after pruning
-  // Import detection logic from intel-index.js would be complex,
-  // so we just update the index. Conventions/summary stay until
-  // next PostToolUse or /gsd:analyze-codebase refresh.
-
-  return { pruned: deleted.length, total: filePaths.length };
-}
-
-// Read JSON from stdin (standard hook pattern)
-let input = '';
-process.stdin.setEncoding('utf8');
-process.stdin.on('data', chunk => input += chunk);
-process.stdin.on('end', () => {
-  try {
-    // Stop hook receives session data, but we don't need it
-    // Just prune stale entries
-    pruneIndex();
-    process.exit(0);
-  } catch (error) {
-    // Silent failure - never block Claude
-    process.exit(0);
-  }
-});

hooks/gsd-intel-session.js

@@ -1,39 +0,0 @@
-#!/usr/bin/env node
-// Codebase Intelligence - SessionStart Context Injection Hook
-// Reads pre-generated summary.md and injects into Claude's context
-
-const fs = require('fs');
-const path = require('path');
-
-// Read JSON from stdin (standard hook pattern)
-let input = '';
-process.stdin.setEncoding('utf8');
-process.stdin.on('data', chunk => input += chunk);
-process.stdin.on('end', () => {
-  try {
-    const data = JSON.parse(input);
-
-    // Only inject on startup or resume
-    if (!['startup', 'resume'].includes(data.source)) {
-      process.exit(0);
-    }
-
-    // Read pre-generated summary (created by gsd-intel-index.js)
-    const summaryPath = path.join(process.cwd(), '.planning', 'intel', 'summary.md');
-
-    if (!fs.existsSync(summaryPath)) {
-      process.exit(0);  // No intel, skip silently
-    }
-
-    const summary = fs.readFileSync(summaryPath, 'utf8').trim();
-
-    if (summary) {
-      process.stdout.write(`<codebase-intelligence>\n${summary}\n</codebase-intelligence>`);
-    }
-
-    process.exit(0);
-  } catch (error) {
-    // Silent failure - never block Claude
-    process.exit(0);
-  }
-});