feat: integrate fork work onto upstream main (squashed)

Squash-merge of feat/autofix-pr-test (69 commits) onto upstream/main
with -X ours strategy (upstream as authoritative for content conflicts).

Key features brought in from fork:
- LocalMemoryRecall + VaultHttpFetch tools (end-to-end wired)
- /local-memory, /local-vault, /memory-stores, /skill-store interactive panels
- /agents-platform, /schedule, /vault command scaffolding
- /login: switch / replace / remove of workspace API key
- statusline refactor (built-in status row, /statusline as info command)
- autofix-pr command + workflow

Conflict resolutions (upstream-wins):
- 10 .js command stubs kept from upstream (alongside fork's .ts implementations)
- src/components/BuiltinStatusLine.tsx accepted upstream's deletion
  (fork's wire-up references in StatusLine.tsx will be cleaned up next)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/mocks/childProcess.ts

@@ -0,0 +1,45 @@
+/**
+ * Shared mock for `node:child_process`.
+ *
+ * Usage:
+ *   import { mock } from 'bun:test'
+ *   import { childProcessMock, execFileMock, execFileSyncMock } from 'tests/mocks/childProcess'
+ *   mock.module('node:child_process', () => childProcessMock)
+ *
+ * Call `execFileMock.mockImplementation(...)` or `execFileSyncMock.mockImplementation(...)`
+ * before each test that needs specific behavior.
+ */
+import { mock } from 'bun:test'
+
+// execFile: node-style callback (cmd, args, opts?, callback)
+export const execFileMock = mock(
+  (
+    _cmd: string,
+    _args: string[],
+    _optsOrCb?: unknown,
+    _cb?: (err: Error | null, stdout: string, stderr: string) => void,
+  ) => {
+    const cb =
+      typeof _optsOrCb === 'function'
+        ? (_optsOrCb as (
+            err: Error | null,
+            stdout: string,
+            stderr: string,
+          ) => void)
+        : _cb
+    if (cb) cb(null, '', '')
+    return null
+  },
+)
+
+// execFileSync: synchronous (returns Buffer)
+export const execFileSyncMock = mock(
+  (_cmd: string, _args: string[], _opts?: unknown): Buffer => {
+    return Buffer.from('')
+  },
+)
+
+export const childProcessMock = {
+  execFile: execFileMock,
+  execFileSync: execFileSyncMock,
+}