docs(handoff): adoption ANSWERED — 4/4 post-fix vs 2/11 pre-fix, and yield is now rank 1

[ZacxDev]

Post-fix adoption measurement for the handoff-search-index effort, plus the ranked list it changes.

The result

Measured 8.6 h after `#1332` merged, same needle as the pre-fix reading:

window	resume runs	queried the index	`cairn recall` (control)
pre-fix, workbench	11	2 (18%)	10 (91%)
post-fix, workbench	4	4 (100%)	4 (100%)
post-fix, laptop	0	—	—

The prediction was that the query would track `cairn recall` rather than step 3's rate. It tracked it exactly. All four post-fix sessions are independent and in `datapacket-talos`; none is the measuring session — checked, because that contamination distorted the first reading. All four queried a topic, which is what the re-keying was for: moving the command alone would not have sufficed, since a session with no open item has nothing to type.

What it does NOT establish

• n=4, not the ~10 the doc asked for, over 8.6 h vs a 34 h pre-fix window.
• The laptop ran 0 resumes — workbench-only reading.
• All four are one repo — same population as the pre-fix non-firing runs, so the comparison is fair, but not evidence about other repos.
• 🔴 Yield is still zero-evidence. Adoption says the command RAN, never that a hit changed a decision. That is now rank 1, and it needs no new data — the four transcripts already exist.

Ranked list

Rank 1 becomes answer yield; ranks 2 and 3 are unchanged (stable numbering, since rank is half a claim's identity). The claim `handoff-search-index-1` was released after `#1332` merged.

Docs-only. Also recorded in the subsystem index: the prior `OPEN:` bullet was rewritten to `RESOLVED 8e9428e:` and a new `OPEN:` bullet filed for yield (put before append, store validated 30/30).

🤖 Generated with Claude Code

https://claude.ai/code/session_01G7eZPAdX7nAeamShBnYNg2