Reads sixteen where the count correction had not reached

[johnnyt]

What

Settles the two count sites that sp-8wv's ADR-0009 amendment (PR 78, main
1015654) corrected by reference but did not reach in text.

The amendment moved decision 8's frozen telemetry list from fourteen event
names to sixteen, by addition, and named two places still reading the old
count: "the Consequences section above and docs/adr/README.md's index
row".

1. docs/adr/README.md's ADR-0009 index row now reads sixteen, edited
   in place. An index-row count correction is an in-place edit by the
   operator's standing word, recorded on sp-74k's dated SCHEDULE note:
   "the index row edit is in-place by the operator's standing word for
   count corrections". This is the one removed line in the diff, and it is
   authorized.
2. A dated Note in ADR-0009, amend-by-addition. Reading the record
   turned up a third site the amendment named nowhere: decision 3's
   inventory heading, "Fourteen events, listed with their measurements
   and metadata in docs/telemetry.md". The Note corrects it by addition
   and moves no decision.

The count is verified, not carried

@events in lib/statifier_persistence/telemetry.ex holds sixteen event
names and StatifierPersistence.Telemetry.events/0 returns them. The two
the amendment added are [:statifier_persistence, :child, :recorded] and
[:statifier_persistence, :child, :settled]. Sixteen is the code's count.

Removed lines

git diff origin/main -- docs/adr/0009-telemetry-events-for-the-durable-stepper.md
shows zero removed lines. The single removed line under docs/adr/ is
the README index row, which is the authorized in-place edit above.

Out of scope

• PR 78's own body says "all four precedent amendment sections" and then
  lists five. That is a merged PR body: historical, body-only, not
  editable here, and deliberately left alone.
• docs/adr/0010-...'s "fourteen callbacks" is a different count (adapter
  callbacks) and is correct as written.
• CHANGELOG.md's 0.6.0 entry names the fourteen events shipped in that
  release. Released changelog text is historical and stays as written.

Gate

Docs-only: the touched paths are outside build_paths and
also_gated_paths is empty in .claude/wurk.json, so the repo's docs-only
exemption applies. CI runs the gate.

Refs: sp-74k

[johnnyt]

Direction review, pass 1: VERDICT UNQUALIFIED, zero findings, zero NEW-SURFACE. Sixteen verified against @events in lib/statifier_persistence/telemetry.ex at the PR head; Note pattern precedent cited at docs/adr/0008-durable-subchart-child-runs.md:627; zero removed lines in the record file, the single removed line under docs/adr/ being the README index row authorized by sp-74k's dated SCHEDULE note. Three non-qualifying tidy-up notes recorded on the bead. Rebased onto 2ef58e2 without conflict; CI green on the rebased head.