🤖 release: v0.28.4

[ibetitsmike]

Summary

Version bump for the v0.28.4 patch release. The headline change since v0.28.3 is Gemini 3.8 Flash becoming the default Gemini Flash model (#4060). The release also carries browser Login with Coder on remote Xum servers (#4047), the opt-in project bundle for settings backup (#4043), the connection-indicator slow-response surfacing (#4059), send-queue and terminal-wake fixes (#4053, #4052), and the Effect Phase 11 runtime refactors.

Implementation

Bumped with node ./scripts/set-package-version.js 0.28.4 so the root package.json and the legacy packages/mux-compat forwarding package stay version-locked (the v0.28.3 bump missed the compat package and broke Test / Unit on main, fixed in #4048). src/common/compat/productIdentity.test.ts passes locally.

After this PR merges, the v0.28.4 tag will be applied to the squash commit and the GitHub Release published to trigger the desktop/npm/docker pipelines.

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Generated with xum • Model: anthropic:claude-fable-5-1 • Thinking: medium • Cost: $0.00

[ibetitsmike]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Breezy!

Reviewed commit: 107d7c3704

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