docs(freeze-record): fill the 2026-10-18 promotion placeholders

[modelmirror-agent]

What

This fills four of the seven placeholders the 2026-10-18 promotion (#2527, dbb042ca4) left in docs/freeze-record.md, with values read from git and the Actions history.

entry (line)	placeholder	value	source
re-docketed detector (#2506), ~10508	staging merge commit	ca25e1285	git log --first-parent origin/staging --grep "Merge pull request #2506 "
same, ~10510	promotion merge commit	dbb042ca4bd6b6d6f4fcb1f02e0d175ac76d0f2c	promotion/2026-10-18 peels to it
same, ~10510	merge date	2026-10-18T01:06:13Z	the merge's committer time; the statpack entry at ~10886 writes it the same way, and the PR's merged_at is 01:06:14Z
live cadence (#2519), ~10929	promotion tag, merge commit, first 12-window run and start	promotion/2026-10-18, dbb042ca4…, run-pull run 39091707696, started 2026-10-18T02:53:58Z	see below

Why that run is the boundary.

• The merge put two 47 * live crons on main. One is the old 47 4,10,16,22; the new one is 47 0,2,6,8,12,14,18,20.
• The first run-pull run after the merge, at 01:35, is a pull window. The first live run after it, 39091707696 at 02:53, is in the 02:47 slot, which only the new cron holds. Its jobs show live: success, and its head 36483f458 is on main after the merge.
• The next one, at 04:50, is a slot both crons share, so it can't mark the cadence change.

Left unfilled: the statpack entry's refresh commit and its OT2026 and OT2025 pools (~10886). No statpack refresh has reached main since the promotion, so they have no value yet. The first refresh after it fills them.

Checks

• On every changed line, landed_placeholder_problems against current main returns []. The two-line live-cadence placeholder is filled by joining its break, which fix(promotion-record): accept a hand fill of a placeholder wrapped across a line break #2508's check now accepts.
• Each value is one line with no <, > or backtick.
• scripts/gate.sh docs-tests passes.

Freeze-record fills only, with no owned paths. After docs-reviewer checks the values against their sources, I'll merge into staging myself; the fills reach main at the next promotion.

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