Correct four task records that said shipped work was not done

[VeryComplexAndLongName]

tasks.md decides whether a change may be archived, and four of them were wrong in the same direction.

Change	Recorded	Actually
run-with-harness-prefills-the-run	0 of 16 done	Shipped entirely in #202; initialCommandKind is in AiPanel.tsx, changeset released in webui 1.25.0
usage-from-acp	5.2, 5.3 open	Checks run; changeset released in core 0.50.0
event-guard-covers-every-kind	4.2, 4.3 open	Checks run; changeset released as a core patch
usage-visible-while-running	5.2, 5.3 open	Checks run; changeset released

One cause, not four slips

Tasks were ticked, the files copied into a worktree and committed, and only then were the checks run and npx changeset invoked — after the commit that would have recorded them. The same order produced the same omission four times, always at the last two items of a list: run the checks and add a changeset.

Verified, not recalled

Every tick was checked against main: the symbol the task names existing in the file it names, the test the task names existing by its own title, and for a changeset item the released entry in the relevant CHANGELOG.md. Fifteen of sixteen items in the prefill change verified this way; the sixteenth is human-only.

The diff was then re-read item by item against that list to confirm nothing else was ticked — 21 boxes, matching 15 + 2 + 2 + 2 exactly. Correcting a wrong record by assumption would just make it wrong in the other direction, and harder to notice.

Human-only items all stay open

Including ci-audit-own-job 3.6, where half is observed (the audit is now its own check) and half is not — that the merge gate reports independently when the audit fails needs a failure to demonstrate. Closing it on the observed half is the inference this change exists to refuse.

Stopping it recurring

openspec/README.md gains the order — run, then tick, then commit — and what the failure looks like from outside, since that is how it will be recognised: a change whose work is plainly in main, whose tasks.md reads as untouched, and which the archive step then refuses.

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