[teamleaderleo]

Problem

Recent nightly feeds can contain validated user-facing summaries while omitting a whatsNew digest. The app then falls back to the generic “All Changes” fold, which makes the What’s New page look stale and loses the New/Improved hierarchy.

Change

• Generate a validated What's New digest from summary lines when no highlight digest is available.
• Add an app-side fallback for already-published summary-only notes, preserving categories and ignoring empty lines.
• Keep the existing embedded digest/highlight paths unchanged.

Validation

• python3 -m unittest tests/test_cmux_next_release_notes.py — 7/7 passed.
• swiftc -parse Packages/macOS/CmuxNext/Sources/CmuxNextUpdater/WhatsNew/WhatsNewSources.swift Packages/macOS/CmuxNext/Tests/CmuxNextAppTests/FeedWhatsNewSourceTests.swift — passed.
• git diff --check — passed.
• Live feed samples observed summaries with whatsNew: false on builds 3909161799401, 3908291645501, and 3907660300601.

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Summary by cubic

Fixes the What's New page falling back to the generic "All Changes" fold when a nightly build ships validated summaries but no highlight digest. Summary lines now generate a What's New digest with the New/Improved/Fixed/Security hierarchy, and existing embedded digest and highlight paths are unchanged.

New Features

• The release-notes generator produces a validated whatsNew digest from user-facing summary lines when no highlight digest exists.
• The macOS app builds a fallback What's New document from summary-only feeds, preserving categories and skipping empty lines.

^{Written for commit d32818c. Summary will update on new commits.}

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[github-actions]

Not verified: macOS jobs did not run: compile and app tests were skipped on d32818c444; ci-status is green without them.

CI passes on d32818c444 (run 39102792580 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.

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[teamleaderleo]

Implementation receipt for exact head 4382e2809efdd03a2577759da98145555a2ea194:

• Live nightly feed evidence: builds 3909161799401, 3908291645501, and 3907660300601 contained summary lines but whatsNew: false, causing the generic Changes fold.
• python3 -m unittest tests/test_cmux_next_release_notes.py — 7/7 passed on the implementation worktree.
• swiftc -parse Packages/macOS/CmuxNext/Sources/CmuxNextUpdater/WhatsNew/WhatsNewSources.swift Packages/macOS/CmuxNext/Tests/CmuxNextAppTests/FeedWhatsNewSourceTests.swift — passed.
• git diff --check — passed.
• Release-notes executable mode preserved as 100755 on this head.

[teamleaderleo]

Bead cx-swam1 created for this PR by the cmux coordinator.

[github-actions]

The feat-cmux-next push run https://github.com/manaflow-ai/cmux/actions/runs/39104072536 at e9c0782 failed: cmux app scheme compile (Debug).
Those jobs last passed at 64a50c4. This pull request is one of 5 merged since: #21458, #21461, #21504, #21459, #21509.
If the failure is in your change, fix forward on feat-cmux-next. Pull requests run only the tiers their paths reach (docs/ci/cmux-next-tiers.md); label a batch PR full-ci to run them all before merging.