feat(runtime): add project-local adapter and plugin discovery under ./.opencli/

Adds a project-local discovery step that loads adapters from
`./.opencli/clis/<site>/<command>.js` and plugins from
`./.opencli/plugins/<plugin>/` when opencli runs inside a project.
Mirrors the existing user-level layer at `~/.opencli/`: same import
surface (`@jackwener/opencli/registry`), same compat shim mechanism,
so a repo can check project-specific adapters into VCS and they
override built-ins for that working directory.

Discovery order (last wins on collision):
  built-in
    -> ~/.opencli/clis
      -> ./.opencli/clis
        -> ~/.opencli/plugins
          -> ./.opencli/plugins

Pure addition. No flags, env vars, or config file. External CLIs
(gh, ntn, tg, ...) are passthrough binaries on a separate
registration path and are unaffected.

Closes the project-isolation half of #1423. The "disable built-ins"
half is intentionally deferred: recent work (#1559 notion -> ntn
migration, #1544 -cli suffix drop) suggests built-in adapter scope
will shrink organically via external-CLI replacement, which
addresses the underlying AI-agent tool-list concern more directly
than a runtime flag.

Changes:
- src/discovery.ts: add projectOpenCliDir / projectClisDir /
  projectPluginsDir helpers, add ensureProjectCliCompatShims
  (reuses ensureUserCliCompatShims with a project root), widen
  discoverPlugins to take an optional dir parameter so project
  plugins can be discovered from ./.opencli/plugins/.
- src/main.ts: thread the new helpers, call
  ensureProjectCliCompatShims in the parallel startup block, run
  discoverClis(PROJECT_CLIS) after USER_CLIS, and
  discoverPlugins(PROJECT_PLUGINS) after the default plugins pass.
- docs/guide/extending-opencli.md: document the project-local
  layout and discovery order.
- src/discovery-project.test.ts: 3 tests covering the path helpers,
  project-local adapter discovery, and project-local plugin
  discovery.

Author: Benjamin-eecs

docs/guide/extending-opencli.md

@@ -1,13 +1,14 @@
 # Extending OpenCLI
 
-OpenCLI has five extension paths. Pick the path based on where you want the source code to live and how you want commands to be shared.
+OpenCLI has six extension paths. Pick the path based on where you want the source code to live and how you want commands to be shared.
 
 | Goal | Use | Source location | Command surface |
 |------|-----|-----------------|-----------------|
 | Build a personal website command in your own Git repo | Local plugin | Your project directory, symlinked into `~/.opencli/plugins/` | `opencli <plugin> <command>` |
 | Quickly draft a private adapter on this machine | User adapter | `~/.opencli/clis/<site>/<command>.js` | `opencli <site> <command>` |
 | Edit an official adapter locally | Adapter override | `~/.opencli/clis/<site>/` | `opencli <site> <command>` |
 | Publish or install third-party commands | Plugin | Git repo, installed into `~/.opencli/plugins/` | `opencli <plugin> <command>` |
+| Scope commands to a single project | Project-local adapter / plugin | `./.opencli/clis/<site>/` or `./.opencli/plugins/<plugin>/` | `opencli <site> <command>` |
 | Wrap an existing local binary | External CLI | `~/.opencli/external-clis.yaml` | `opencli <tool> ...` |
 
 ## Personal commands in your own Git repo
@@ -132,3 +133,18 @@ opencli my-tool --help
 ```
 
 External CLIs pass stdio and exit codes through to the underlying binary.
+
+## Project-local adapters and plugins
+
+When a project ships its own opencli commands, place them under `./.opencli/` next to the source tree so they can be checked into version control alongside the rest of the project.
+
+```text
+my-project/
+  .opencli/
+    clis/<site>/<command>.js     # adapters local to this project
+    plugins/<plugin>/<file>.js   # plugins local to this project
+```
+
+Project-local commands are discovered when `opencli` runs from a directory that contains `./.opencli/`. The discovery order is `built-in → user (~/.opencli) → project (./.opencli)`, so a project adapter overrides a user adapter, which in turn overrides a built-in adapter with the same `site/command`.
+
+Use this layout to keep a small, repo-scoped set of commands available to AI agents working inside that project, without polluting the global `~/.opencli/` namespace.

src/discovery-project.test.ts

@@ -0,0 +1,80 @@
+/**
+ * Tests for project-local discovery: ./.opencli/clis and ./.opencli/plugins.
+ */
+
+import { describe, it, expect } from 'vitest';
+import * as fs from 'node:fs';
+import * as os from 'node:os';
+import * as path from 'node:path';
+import { pathToFileURL } from 'node:url';
+import {
+  discoverClis,
+  discoverPlugins,
+  projectClisDir,
+  projectOpenCliDir,
+  projectPluginsDir,
+} from './discovery.js';
+import { getRegistry } from './registry.js';
+
+describe('project-local discovery paths', () => {
+  it('projectOpenCliDir / projectClisDir / projectPluginsDir resolve relative to the given cwd', () => {
+    const cwd = '/tmp/example-project';
+    expect(projectOpenCliDir(cwd)).toBe(path.join(cwd, '.opencli'));
+    expect(projectClisDir(cwd)).toBe(path.join(cwd, '.opencli', 'clis'));
+    expect(projectPluginsDir(cwd)).toBe(path.join(cwd, '.opencli', 'plugins'));
+  });
+
+  it('discoverClis(projectDir) loads adapters from a project-local clis directory', async () => {
+    const tempRoot = await fs.promises.mkdtemp(path.join(os.tmpdir(), 'opencli-project-clis-'));
+    const site = 'project-local-site';
+    const registryUrl = pathToFileURL(path.join(process.cwd(), 'src', 'registry.ts')).href;
+
+    try {
+      const siteDir = path.join(tempRoot, site);
+      await fs.promises.mkdir(siteDir, { recursive: true });
+      await fs.promises.writeFile(path.join(siteDir, 'hello.js'), `
+import { cli, Strategy } from '${registryUrl}';
+cli({
+  site: '${site}',
+  name: 'hello', access: 'read',
+  description: 'hello command',
+  strategy: Strategy.PUBLIC,
+  browser: false,
+  func: async () => [{ ok: true }],
+});
+`);
+
+      await discoverClis(tempRoot);
+      expect(getRegistry().get(`${site}/hello`)).toBeDefined();
+    } finally {
+      await fs.promises.rm(tempRoot, { recursive: true, force: true });
+    }
+  });
+
+  it('discoverPlugins(dir) loads plugin files from a project-local plugins directory', async () => {
+    const tempRoot = await fs.promises.mkdtemp(path.join(os.tmpdir(), 'opencli-project-plugins-'));
+    const pluginName = 'project-plugin-site';
+    const pluginDir = path.join(tempRoot, pluginName);
+    const registryUrl = pathToFileURL(path.join(process.cwd(), 'src', 'registry.ts')).href;
+
+    try {
+      await fs.promises.mkdir(pluginDir, { recursive: true });
+      await fs.promises.writeFile(path.join(pluginDir, 'hi.js'), `
+import { cli, Strategy } from '${registryUrl}';
+cli({
+  site: '${pluginName}',
+  name: 'hi', access: 'read',
+  description: 'hi command',
+  strategy: Strategy.PUBLIC,
+  browser: false,
+  func: async () => [{ ok: true }],
+});
+`);
+
+      await discoverPlugins(tempRoot);
+      expect(getRegistry().get(`${pluginName}/hi`)).toBeDefined();
+    } finally {
+      await fs.promises.rm(tempRoot, { recursive: true, force: true });
+    }
+  });
+});

src/discovery.ts

@@ -24,6 +24,18 @@ export const USER_OPENCLI_DIR = path.join(os.homedir(), '.opencli');
 export const USER_CLIS_DIR = path.join(USER_OPENCLI_DIR, 'clis');
 /** Plugins directory: ~/.opencli/plugins/ */
 export const PLUGINS_DIR = path.join(USER_OPENCLI_DIR, 'plugins');
+/** Project-local opencli root, resolved against the current working directory at call time. */
+export function projectOpenCliDir(cwd: string = process.cwd()): string {
+  return path.join(cwd, '.opencli');
+}
+/** Project-local CLIs directory: ./.opencli/clis */
+export function projectClisDir(cwd: string = process.cwd()): string {
+  return path.join(projectOpenCliDir(cwd), 'clis');
+}
+/** Project-local plugins directory: ./.opencli/plugins */
+export function projectPluginsDir(cwd: string = process.cwd()): string {
+  return path.join(projectOpenCliDir(cwd), 'plugins');
+}
 /** Matches files that register commands via cli() or lifecycle hooks */
 const PLUGIN_MODULE_PATTERN = /\b(?:cli|onStartup|onBeforeExecute|onAfterExecute)\s*\(/;
 
@@ -88,6 +100,19 @@ export async function ensureUserAdapters(): Promise<void> {
   await fs.promises.mkdir(USER_CLIS_DIR, { recursive: true });
 }
 
+/**
+ * Set up the package-exports symlink for a project-local `.opencli` directory
+ * so adapters under `./.opencli/clis/` can `import { cli } from '@jackwener/opencli/registry'`.
+ *
+ * Mirrors `ensureUserCliCompatShims` but scoped to a project root. Returns
+ * silently when the project root has no `.opencli/` directory yet.
+ */
+export async function ensureProjectCliCompatShims(cwd: string = process.cwd()): Promise<void> {
+  const baseDir = projectOpenCliDir(cwd);
+  try { await fs.promises.access(baseDir); } catch { return; }
+  await ensureUserCliCompatShims(baseDir);
+}
+
 /**
  * Discover and register CLI commands.
  * Uses pre-compiled manifest when available for instant startup.
@@ -154,7 +179,7 @@ async function loadFromManifest(manifestPath: string, clisDir: string): Promise<
 async function discoverClisFromFs(dir: string): Promise<void> {
   try { await fs.promises.access(dir); } catch { return; }
   const entries = await fs.promises.readdir(dir, { withFileTypes: true });
-  
+
   const sitePromises = entries
     .filter(entry => entry.isDirectory())
     .map(async (entry) => {
@@ -182,15 +207,18 @@ async function discoverClisFromFs(dir: string): Promise<void> {
 }
 
 /**
- * Discover and register plugins from ~/.opencli/plugins/.
+ * Discover and register plugins from a plugins directory.
+ * Defaults to `~/.opencli/plugins/`; pass a custom directory to load
+ * project-local plugins from `./.opencli/plugins/`.
+ *
  * Each subdirectory is treated as a plugin (site = directory name).
  * Files inside are scanned flat (no nested site subdirs).
  */
-export async function discoverPlugins(): Promise<void> {
-  try { await fs.promises.access(PLUGINS_DIR); } catch { return; }
-  const entries = await fs.promises.readdir(PLUGINS_DIR, { withFileTypes: true });
+export async function discoverPlugins(dir: string = PLUGINS_DIR): Promise<void> {
+  try { await fs.promises.access(dir); } catch { return; }
+  const entries = await fs.promises.readdir(dir, { withFileTypes: true });
   await Promise.all(entries.map(async (entry) => {
-    const pluginDir = path.join(PLUGINS_DIR, entry.name);
+    const pluginDir = path.join(dir, entry.name);
     if (!(await isDiscoverablePluginDir(entry, pluginDir))) return;
     await discoverPluginDir(pluginDir, entry.name);
   }));

src/main.ts

@@ -91,7 +91,7 @@ if (getCompIdx !== -1) {
 
 // ── Full startup path ───────────────────────────────────────────────────
 // Dynamic imports: these are deferred so the fast path above never pays the cost.
-const { discoverClis, discoverPlugins, ensureUserCliCompatShims, ensureUserAdapters } = await import('./discovery.js');
+const { discoverClis, discoverPlugins, ensureUserCliCompatShims, ensureUserAdapters, ensureProjectCliCompatShims, projectClisDir, projectPluginsDir } = await import('./discovery.js');
 const { getCompletions } = await import('./completion.js');
 const { runCli } = await import('./cli.js');
 const { emitHook } = await import('./hooks.js');
@@ -100,25 +100,30 @@ const { registerUpdateNoticeOnExit, checkForUpdateBackground } = await import('.
 
 installNodeNetwork();
 
+const PROJECT_CLIS = projectClisDir();
+const PROJECT_PLUGINS = projectPluginsDir();
+
 // Parallelise independent startup I/O:
 //  - Built-in adapter discovery has no dependency on user-dir setup.
 //  - ensureUserCliCompatShims and ensureUserAdapters operate on different paths
 //    (~/.opencli/node_modules/ vs ~/.opencli/clis/ + adapter-manifest.json).
 //  - registerCommand() overwrites on name collision (see registry.ts), so
-//    user-CLI discovery MUST run after built-in discovery to preserve the
-//    intended override order (user adapters override built-in ones).
-//  - discoverPlugins runs last: plugins may override both built-in and user CLIs.
+//    later layers MUST run after earlier ones to preserve the override order:
+//    built-in < user < project < plugin < project-plugin (last wins).
 const skipUserDiscovery = argv[0] === 'convention-audit';
 if (skipUserDiscovery) {
   await discoverClis(BUILTIN_CLIS);
 } else {
-  const [, ,] = await Promise.all([
+  await Promise.all([
     ensureUserCliCompatShims(),
     ensureUserAdapters(),
+    ensureProjectCliCompatShims(),
     discoverClis(BUILTIN_CLIS),
   ]);
   await discoverClis(USER_CLIS);
+  await discoverClis(PROJECT_CLIS);
   await discoverPlugins();
+  await discoverPlugins(PROJECT_PLUGINS);
 }
 
 // Register exit hook: notice appears after command output (same as npm/gh/yarn)