fix(ci): scope RC release notes to the previous RC

[EtienneLescot]

Problem

Every RC of a line ships the same release body. v1.8.0-rc.8 and v1.8.0-rc.9 are byte-identical; v1.9.0-rc.2 repeats all 18 of rc.1's entries before its own. The one question an RC body has to answer — what changed since the last RC — is the one it doesn't.

Two independent causes:

1. The notes start tag is derived from the stable version. STABLE_VERSION="${VERSION%%-*}" strips -rc.N, so every RC of 1.9.0 gets v1.8.0 as its start tag and spans the whole release.

2. --generate-notes lists only PRs GitHub manages to associate, and it drops real ones. #254 and #261 were both merged into release/v1.9.0 and both are in the rc.2 tag, yet neither appears in rc.2's body. Five of the eleven commits in v1.9.0-rc.1..v1.9.0-rc.2 are invisible — including fix(export): stop drawing the screen inside the PiP box on camera-less clips. An RC body can silently omit the fix it was cut for.

Fix

• Resolve the previous RC of the same line as the start tag, walking down from the current rc number so a skipped or failed RC doesn't break the chain. rc.1 still falls back to the previous stable.
• Build the RC body from git log over that range. The commit range is the actual diff and can't lie.
• Stable releases are untouched — they keep --generate-notes for PR links and New Contributors.
• fetch-depth: 0 on the publish job's checkout, needed for the tags and history.

What rc.2 would have looked like

## Changes since v1.9.0-rc.1

- fix(ci): sign the macOS .app ad-hoc when no certificate is available
- fix(recording): stream the native webcam to disk instead of losing it
- test(recording): make the re-index suite run off Linux
- fix(ci): notarize release candidates like stable releases
- fix(build): declare all 13 supported locales in the AppX package
- ci(macos): reject a MAC_CSC_NAME that carries its certificate type
- fix(recording): stop the WGC helper from hanging on stop
- fix(recording): stop a webcam finalize from discarding the screen capture
- ci(diagnostic): build the bundle for release branches too
- fix(export): stop drawing the screen inside the PiP box on camera-less clips
- fix(layout): resolve the webcam layout per clip, not once per timeline

Verification

Ran locally against the real tag graph:

• start-tag resolution: rc.1 → v1.8.0, rc.2 → v1.9.0-rc.1, v1.9.0 → v1.8.0, v1.8.0-rc.9 → v1.8.0-rc.8, and an unstarted line falls back correctly.
• the notes block dry-run under GitHub's shell flags (set -eo pipefail) for the prerelease path, the stable path, and an empty range — the last one being the set -e risk, since git log over an empty range is what a re-tag would hit. All exit 0.
• YAML parses; both edited run: blocks pass bash -n.

Targets release/v1.9.0 so an rc.3 gets it immediately; reaches main through the usual back-merge at promote.

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