refactor(channels): make built-in channels self-contained (#4908)

* refactor(channels): own setup and instance contracts

* refactor(channels): isolate management contracts

* refactor(channels): normalize activation contracts

* fix(channels): enforce management contracts

* refactor(channels): finish setup ownership migration

* fix(channels): harden management contracts

* fix(channels): enforce lazy loading and runtime ownership

* fix(feishu): make multi-instance startup idempotent

* fix(webui): render channel setup contracts cleanly

* fix(feishu): stop websocket clients cleanly

* fix(channels): enforce persistence and activation gates

* fix(channels): preserve global feature action scope

* fix(channels): apply defaults for single plugins

* fix(channels): enforce management contract boundaries

* refactor(feishu): remove identity helper indirection

* fix(channels): preserve management setup contracts

* refactor(channels): generalize instance settings UI

* refactor(channels): package channel plugins with web UI metadata

* refactor(channels): make built-ins self-contained packages

* test(channels): colocate tests with channel packages

* fix(dingtalk): use official brand icon

* feat(channels): colocate webui translations

* docs(channels): clarify plugin ownership

* test(exec): remove output wait race

* refactor(channels): unify plugin descriptors

* fix(channels): enforce descriptor-owned contracts

* refactor(channels): finish package-owned plugin setup

* refactor(channels): use repository-owned packages only

* fix(channels): self-describe dependencies and runtime state

* fix(channels): warn about legacy entry points

tests/webui/test_build.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import os
+import tomllib
 from pathlib import Path
 
 from nanobot.webui.build import ensure_webui_bundle, inspect_webui_bundle
@@ -56,6 +57,28 @@ def test_inspect_webui_bundle_detects_source_newer_than_dist(tmp_path: Path) ->
     assert status.newest_source == source / "src" / "App.tsx"
 
 
+def test_inspect_webui_bundle_detects_channel_owned_ui_source(tmp_path: Path) -> None:
+    source = tmp_path / "webui"
+    dist = tmp_path / "nanobot" / "web" / "dist"
+    channel_ui = tmp_path / "nanobot" / "channels" / "example" / "webui" / "index.tsx"
+    _touch(source / "package.json", mtime_ns=10)
+    _touch(dist / "index.html", mtime_ns=20)
+    _touch(channel_ui, mtime_ns=30)
+
+    status = inspect_webui_bundle(source_dir=source, dist_dir=dist)
+
+    assert status.needs_build is True
+    assert status.reason == "source_newer"
+    assert status.newest_source == channel_ui
+
+
+def test_channel_owned_ui_sources_are_included_in_distributions() -> None:
+    project_root = Path(__file__).resolve().parents[2]
+    pyproject = tomllib.loads((project_root / "pyproject.toml").read_text(encoding="utf-8"))
+
+    assert "nanobot/channels/*/webui/**/*" in pyproject["tool"]["hatch"]["build"]["include"]
+
+
 def test_inspect_webui_bundle_accepts_fresh_dist(tmp_path: Path) -> None:
     source = tmp_path / "webui"
     dist = tmp_path / "nanobot" / "web" / "dist"