Promote Alpha to Main

[Yuqing (mydmdm)]

Promotion

Promote the currently integrated Alpha revision to stable main.

• Base: main at ef481056f090f9065c2456ad13a461204a956b51
• Head: alpha at 191a79c8434d4f1374fdd29160fec656f1780c5f
• Current comparison: alpha is 21 commits ahead and 10 commits behind main; the branches diverged after the previous promotion. Review the complete PR diff and preserve the main-only changes when merging.

Included Alpha pull requests

• Fix Windows ACP wrapper resolution #281 — Fix Windows ACP wrapper resolution
• Fix remote Agent RFS public origin #282 — Fix remote Agent RFS public origin
• Add portable Capability Packages for external agents #286 — Add portable Capability Packages for external agents
• Fix stalled Canvas Sync SSE connections #290 — Fix stalled Canvas Sync SSE connections

Related issues

This section records delivery relationships without adding automatic close keywords.

Delivered by this Alpha promotion

• Windows: detected ACP CLI wrappers are disabled in the structured harness picker #249 — Windows ACP wrapper discovery and structured launch resolution (Fix Windows ACP wrapper resolution #281)
• Hotfix remote Agent RFS reachback to use a reachable public origin #280 — Reachable public origin for remote Agent RFS and Agentlet connections (Fix remote Agent RFS public origin #282; issue closed)
• Expose configured Huabu capabilities to external agents #110 — Portable Service Packages and external Agent capability access (Add portable Capability Packages for external agents #286; issue remains open on GitHub pending issue-state reconciliation)
• RFS-created Notes intermittently require page refresh to appear on Canvas #252 — Recovery from stalled Canvas Sync SSE connections (Fix stalled Canvas Sync SSE connections #290; issue remains open on GitHub pending issue-state reconciliation)

Previously delivered milestones, already in Main

• Follow-up: Agent lifecycle, unified Settings, Windows discovery, and multi-Agentlet enrollment #253 — Agent/Capabilities Settings and Utility Agent milestones via Unify Agent and capability Settings surfaces #263/Separate Utility Agent from conversation selection #264, with related capacity, Windows discovery, and multi-Agentlet work delivered via Reclaim ACP Jobs and configurable agentlet capacity #261, Fix Windows ACP wrapper resolution #281, and Manage multiple Agentlet devices and device-scoped Profiles #268/Fix hostname-era Agentlet Profile compatibility #271. The umbrella's approved scope is complete; its issue remains open pending explicit state reconciliation.

Promotion checks

• Confirm the Canary running revision matches promotion head 191a79c8.
• Confirm Windows ACP wrapper discovery and launch behavior has been exercised in the intended Canary environment.
• Confirm remote connected Agent reachback uses the configured HUABU_PUBLIC_ORIGIN and can access its Canvas RFS endpoint.
• Confirm the two new Canvas Sync watchdog behaviors after deployment.
• Required GitHub checks pass for promotion head 191a79c8.
• Review the complete main...alpha diff, including the 10 main-only commits absent from the current Alpha ancestry.

Canary use is additional end-to-end evidence only. It does not replace automated tests, CI, review, documentation, or release validation. This PR does not enable auto-merge and must be merged manually after the promotion checks are satisfied.

After merge, fast-forward alpha to the resulting main promotion commit before starting the next Alpha cycle.