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