Initial commit: pi-project-map skill scaffolding

- Design doc with full spec (dense markdown format, hybrid AST+LLM pipeline,
  consumption model, stale data mitigation)
- Implementation plan with 6 milestones and rollout strategy
- TypeScript package structure with all source stubs
- CLI entry point, formatter, discover, init, patch, validate, extract, merge
- Pi SKILL.md with tool definitions and format documentation

src/cli.ts

@@ -0,0 +1,32 @@
+#!/usr/bin/env node
+import { initProject } from './init.js';
+import { patchFile } from './patch.js';
+import { validateMaps } from './validate.js';
+import { reinitPath } from './init.js';
+
+const args = process.argv.slice(2);
+const command = args[0];
+
+async function main() {
+  switch (command) {
+    case 'init':
+      await initProject(args[1] || '.');
+      break;
+    case 'patch':
+      await patchFile(args[1]);
+      break;
+    case 'validate': {
+      const result = await validateMaps(args[1] || '.');
+      process.exit(result.clean ? 0 : 1);
+      break;
+    }
+    case 'reinit':
+      await reinitPath(args[1] || '.');
+      break;
+    default:
+      console.log(`Usage: project-map <init|patch|validate|reinit> [path]`);
+      process.exit(1);
+  }
+}
+
+main();