Release record R1: next release draft, release names, Flight progress

[jfillman]

What

The Record tab opens with the release in progress, before any of it reaches Flight. This is R1 of the Release Record proposal: read-only and computed from data Tower already loads, with nothing saved.

• Next release card
  • Scope: source PRs merged after the previous release's commit landed.
  • Incoming: open PRs.
  • The issues those PRs close, read from GitHub closing keywords.
  • Candidate images built from main since the previous release, with where each runs on Ground, for how long, and how many PRs it contains.
  • A suggested version.
  • Display-only readiness checks on the leading candidate.
  • Promote sends the leading candidate to the first Flight environment through the existing promote flow.
• Release names: a tree per release, in order per app (ASPEN, BIRCH, CEDAR…). Names come from the committed record history (needs backstage's new /release-records route). A release that reached Flight but never got a record stays unnamed, so later names never shift.
• Flight progress on each record when an app has more than one Flight environment (staging/pre-prod/prod).
• PR attribution fix: a record's PRs are bounded by when its commit landed on main, not by when it reached Flight. The draft uses the same boundary, so a PR is never in both.
• Flow slug mirror: 256 × 256 word lists, matching glidepath#109, with the same pinned vectors.
• Docs: docs/release-records.md (in the nav), plus the README/index highlights.

Verified

• tsc, lint and yarn ratchet are clean. All 783 tests pass, including new ones for the draft builder, names, the card, and the slug mirror.
• Live in the local harness against kind-prod and kiac-dev, with this branch's dist and the matching backstage branch:
  • boarding-api: draft IRONWOOD after HAZEL with 5 scope PRs; records ASPEN→HAZEL; Flight progress across staging, pre-prod and prod.
  • gate-api: draft IRONWOOD after HAZEL. 1.1.3 has no committed record and correctly shows unnamed. Before the fix it took a name and shifted every later one.

Not in this PR

• Sign-off and gating, saved drafts, and outcome tracking (R2/R3).
• The 24h soak target is a constant for now.

🤖 Generated with Claude Code