[lawrencecchen]

Base red, priority zero. ChiefSidebar is a public @Observable class. Under InternalImportsByDefault the macro's public Observable conformance needs public import Observation. Every CmuxNext package build of feat-cmux-next fails with cannot use protocol 'Observable' in a public or '@usableFromInline' conformance; 'Observation' was not imported publicly (cmux-ci step dcf9d85d09a1fe772bf22fdf, aws-m4pro-3). No open PR fixes it (#22852 touches the file's imports but keeps import Observation).

Changelog

none

Observed / Not run

• Observed: the compile error in the step log at the base.
• Not run: a separate compile of this one-word change.

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Summary by cubic

Fixes the compile error on the feat-cmux-next base by making the Observation import public in ChiefSidebar.swift.

Since ChiefSidebar is a public @Observable class, the macro's public Observable conformance requires public import Observation under InternalImportsByDefault. Without this change, every CmuxNext package build fails with "cannot use protocol 'Observable' in a public or '@usableFromInline' conformance; 'Observation' was not imported publicly."

^{Written for commit e50d6f3. Summary will update on new commits.}

[teamleaderleo]

Bead cx-4x9mp created for this PR by the cmux coordinator.

[lawrencecchen]

Fleet: cmux-ci step 82f063ddf835c64e09afcca2 on aws-m4pro-5 (Xcode 26.6), ref 554773e = #22887 + #22898 + #22853 on feat-cmux-next. CmuxNext built with tests (this proves #22898 clears the ChiefSidebar red and #22853 clears the SidebarPriorityRowView red). BrowserCookieImportSecurityTests and CookieImportCommandTests passed.

[github-actions]

cmux status _{(one comment, edited in place; each line is updated by the job that owns it)}

Not verified: macOS jobs did not run: compile and app tests were skipped on e50d6f30c4; ci-status is green without them.

CI passes on e50d6f30c4 (run 39541581963 attempt 1).
macOS jobs did not run: compile and app tests were skipped: Fast static checks skipped (the macos job needs both to succeed). Re-run CI once they pass, before merging.

Written by scripts/ci/classify_failures.py (ci-failure-attribution.yml); signatures are its SIGNATURES table. A machine verdict is the runner's fault, not this PR's; yours means the failing file is one this PR changes, also red on main that main's latest full suite fails the same way, seen on other PRs that it failed on another pull request's run lately.

[lawrencecchen]

Correctness review (subagent, correctness first): PASS

ChiefSidebar is a public @Observable class in an InternalImportsByDefault target, so the one-word change is the minimal fix. Client visibility does not widen: AgentPriorityMarks.swift already has public import Observation. No module declares a clashing Observable or Observation* name, and no other public @Observable class in CmuxNextAgentLanes has the same issue. The fleet build is in the comment above.

[lawrencecchen]

The base already has this fix (#22905 landed the same one-word change as 89e9c65). Closing as a duplicate.