Add Grok orchestration group routing (#8058)

* docs: design Grok orchestration group

* docs: plan Grok orchestration group implementation

* fix: add Grok orchestration group

* test(orchestration): accept Windows skill newlines

* Fix @grok orchestration group matching and remove stale planning docs

- Reuse the shared buildAgentNameRe matcher in groups.ts instead of a
  divergent local regex, so orchestration groups honor the same
  Windows launcher-suffix rule (grok.exe/.cmd/.bat/.ps1) as the rest
  of Orca's agent-title detection.
- Add test coverage for real Grok OSC title shapes (spinner-collapsed,
  session titles) and Windows launcher-suffix titles.
- Delete the now-completed design and implementation-plan docs for
  the Grok orchestration group work.

---------

Co-authored-by: Jinjing <6427696+AmethystLiang@users.noreply.github.com>

src/main/runtime/orchestration/groups.test.ts

@@ -30,6 +30,7 @@ describe('isGroupAddress', () => {
     expect(isGroupAddress('@idle')).toBe(true)
     expect(isGroupAddress('@claude')).toBe(true)
     expect(isGroupAddress('@droid')).toBe(true)
+    expect(isGroupAddress('@grok')).toBe(true)
     expect(isGroupAddress('@worktree:wt_1')).toBe(true)
   })
 
@@ -169,6 +170,54 @@ describe('resolveGroupAddress', () => {
       const result = resolveGroupAddress('@Claude', 'term_a', terminals, noStatus)
       expect(result).toEqual(['term_b'])
     })
+
+    it('matches @grok as a standalone title token and excludes sender', () => {
+      const terminals = [
+        makeSummary('term_a', { title: 'Grok' }),
+        makeSummary('term_b', { title: 'GROK CLI' }),
+        makeSummary('term_c', { title: '⠋ Grok' }),
+        makeSummary('term_d', { title: 'ngrok' }),
+        makeSummary('term_e', { title: '/tmp/grok' }),
+        makeSummary('term_f', { title: 'my-grok-worker' }),
+        makeSummary('term_g', { title: 'Codex CLI' })
+      ]
+
+      const result = resolveGroupAddress('@GrOk', 'term_a', terminals, noStatus)
+
+      expect(result).toEqual(['term_b', 'term_c'])
+    })
+
+    // Why: the resolver sees the raw OSC title, and Grok CLI's real working/session
+    // titles carry a trailing " - grok" identity or a spinner-collapsed "⠋ grok"
+    // (see terminal-title-agent-type.ts). Prove those production shapes resolve.
+    it('matches real Grok OSC working and session titles', () => {
+      const terminals = [
+        makeSummary('coordinator', { title: 'Coordinator' }),
+        makeSummary('term_rotating', { title: '⠋ - fix the flaky suite - grok' }),
+        makeSummary('term_collapsed', { title: '⠋ grok' }),
+        makeSummary('term_session', { title: 'Fix the auth bug - grok' })
+      ]
+
+      const result = resolveGroupAddress('@grok', 'coordinator', terminals, noStatus)
+
+      expect(result).toEqual(['term_rotating', 'term_collapsed', 'term_session'])
+    })
+
+    // Why: Windows agent titles can surface the launcher process name (`grok.exe`);
+    // the shared matcher accepts .exe/.cmd/.bat/.ps1 suffixes but still rejects
+    // arbitrary dotted fragments like `grok.py`.
+    it('matches Windows launcher-suffix titles but not arbitrary dotted tokens', () => {
+      const terminals = [
+        makeSummary('coordinator', { title: 'Coordinator' }),
+        makeSummary('term_exe', { title: 'grok.exe' }),
+        makeSummary('term_cmd', { title: 'grok.cmd running' }),
+        makeSummary('term_dotted', { title: 'grok.py' })
+      ]
+
+      const result = resolveGroupAddress('@grok', 'coordinator', terminals, noStatus)
+
+      expect(result).toEqual(['term_exe', 'term_cmd'])
+    })
   })
 
   describe('unknown groups', () => {

src/main/runtime/orchestration/groups.ts

@@ -1,3 +1,4 @@
+import { buildAgentNameRe } from '../../../shared/agent-name-token-match'
 import type { RuntimeTerminalSummary } from '../../../shared/runtime-types'
 
 // Why: group addresses enable broadcast messaging to logical groups of agents.
@@ -11,7 +12,8 @@ const AGENT_NAME_GROUPS = [
   'opencode',
   'mimo',
   'gemini',
-  'droid'
+  'droid',
+  'grok'
 ] as const
 
 export type GroupAddress =
@@ -24,13 +26,11 @@ export function isGroupAddress(to: string): boolean {
   return to.startsWith('@')
 }
 
-function escapeRegExp(value: string): string {
-  return value.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
-}
-
 function titleMatchesAgentNameGroup(title: string, agentName: string): boolean {
-  const tokenRe = new RegExp(`(?<![\\w./\\\\-])${escapeRegExp(agentName)}(?![\\w./\\\\-])`, 'i')
-  return tokenRe.test(title)
+  // Why: reuse the shared whole-token matcher so orchestration groups honor the
+  // same Windows launcher-suffix rule (e.g. `grok.exe`) as the rest of Orca's
+  // agent-title detection, instead of maintaining a divergent regex here.
+  return buildAgentNameRe(agentName).test(title)
 }
 
 export function resolveGroupAddress(