docs(qa): step 6 of the coverage sweep no longer sends the record to runs/ (#14983)

SWEEP.md step 6 told every sweep agent to "land the run record under `runs/`".
That directory is git-ignored (`*`, minus its README and .gitignore), so the
instruction is unexecutable: `git add` on an ignored path is a near-silent
no-op, and an agent that obeys the step believes it filed a record that does
not exist.

Two facts decide the replacement text, both measured rather than assumed:

- `runs/README.md` and `RUNNER.md` name the destination for a run record --
  one `qa-run` GitHub issue, text only, body contract in RUNNER.md.
- A coverage sweep does not produce a run record at all. README.md splits the
  two skills: `checklist-author` authors items per SWEEP.md, `checklist-test`
  executes them and emits a run record per RUNNER.md. `checklist-author`'s own
  deliverables are the authored `areas/*.json` items, the reconciled
  `coverage.json` and the `FOLLOW-UPS.md` entries -- no record. Every one of
  the 20 most recent `qa-run` issues is an execution record whose title
  carries a build sha and PASS/PARTIAL/FAIL counts, none of which a sweep has.

So step 6 now states the sweep's actual durable output and attributes the run
record to `checklist-test`, pointing at both source docs by the names they use
for themselves -- rather than sending a sweep to file a `qa-run` issue whose
body contract it structurally cannot satisfy.


Claude-Session: https://claude.ai/code/session_019RfFHiRCSs3JXLK4cwcfox

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: claude[bot] <209825114+claude[bot]@users.noreply.github.com>

Author: claude[bot]

docs/qa/platform-checklist/SWEEP.md

@@ -62,9 +62,12 @@ single reader would not have covered.
 5. **Reconcile `coverage.json` centrally** (a single writer): un-waive any kind a hunter
    proved has a stock fixture, map new items to their kinds, pin `enumSource` on any new
    variants matrix.
-6. **Validate** `node scripts/check-platform-checklist.mjs` until green, then land the
-   run record under `runs/` and surface product defects / docs drift to the maintainer
-   in `FOLLOW-UPS.md`.
+6. **Validate** `node scripts/check-platform-checklist.mjs` until green, then surface
+   product defects / docs drift to the maintainer in `FOLLOW-UPS.md` — with the authored
+   items and the reconciled `coverage.json`, that register is the sweep's whole durable
+   output. A sweep files **no run record**: that artifact belongs to `checklist-test`,
+   and it never lands under `runs/` (git-ignored) but as one `qa-run` GitHub issue —
+   [runs/README.md](./runs/README.md), body contract in [RUNNER.md](./RUNNER.md).
 
 ## Discipline that made the 2026-08 sweep trustworthy