Summary

• treat canonical main session-key alias as equivalent in ChatViewModel
• add/adjust tests to cover alias handling and avoid A2UI waiting-state mismatch

Testing

• not run in this PR prep flow

Greptile Summary

Fixes a bug where the Chat UI's ChatViewModel would silently drop external-run completion events when the gateway published the canonical session key "agent:main:main" but the UI was initialized with the short alias "main". This caused the UI to miss history refreshes from runs completed by other clients or agent surfaces.

• Extracts session key comparison into a new matchesCurrentSessionKey static method in ChatViewModel.swift that normalizes and compares keys, with a special-case bidirectional alias match for "main" ↔ "agent:main:main" — consistent with how the TypeScript UI already handles this in app-render.helpers.ts
• Adds acceptsCanonicalSessionKeyEventsForExternalRuns test covering the fix, and an acceptsCanonicalSessionKeyEventsForOwnPendingRun test documenting that own-run events already bypassed the session key guard via the isOurRun flag

Confidence Score: 5/5

• This PR is safe to merge — it's a targeted bug fix with good test coverage and no risky side effects.
• The change is narrow and well-scoped: it replaces a raw string inequality check with a method that also handles a known alias pair. The alias pattern is already established in the TypeScript codebase. The new static method is pure (no side effects), the guard logic is preserved, and the test directly exercises the fixed scenario. No regressions are expected.
• No files require special attention.

_{Last reviewed commit: 8a45e9a}