feat(plugin): a recognized retrieval miss has a route, and the record comes first (#4133)

The tuning loop shipped in steps 4 and 6 and logged zero events in its
lifetime. `tune_retrieval`, `retrieval_telemetry` and `retrieval_surfaces`
appeared on no instruction surface at all — not the skills, not the hooks,
not the MCP instructions — so the decision that "the model should be the
thing handling it 9 times out of 10" could not begin to happen.

What was missing was not an auditor but a route. `using-scribe` now carries
it, ordered: read the refused records, fix the trigger, and only then
consider the dial. The order is the content. A rule's `when_to_apply` IS
the text its score is computed against, so a miss is evidence about that
text first; rewording one trigger changes one rule's reach, while moving a
floor changes what every record on the surface does and cannot tell a
badly-worded trigger from a genuinely distant one.

Measured, and the reason the order is asserted rather than suggested: rule
1 scored 0.6515 and ranked 5th for the moment it governed, behind three
rules that restrained the same act. Every percentile said "lower the
floor"; at 0.60 the arm delivered those three restraints and still not rule
1. Rewriting the trigger to lead with the symptom put it 1st at 0.7130.

Also: the create path gets a precondition. A new record is itself a
retrieval-affecting act, so before writing one, what_might_apply asks what
already covers that moment — fifty candidates and no bar, because a bar is
what lets the existing record hide.

`_INSTRUCTIONS` gets one index line, not the route: 1,986 of 2,000
characters, since Claude Code cuts the rest mid-word (#2562).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01821k5B3Ysecp9fNYs92Kuy

plugin/.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "scribe",
   "description": "Scribe for Claude Code: connects the scribe MCP server, adds the hooks that deliver live project state and relevant records at the right moment, ships the shared client-neutral Scribe skills (using-scribe, writing-plans, reporting-back, systematic-debugging, verification, brainstorming, reusing-code, shape-accounting), and syncs your saved Scribe Processes as skills (/scribe:sync).",
-  "version": "2026.09.17.1618",
+  "version": "2026.09.18.0436",
   "author": {
     "name": "Bryan Van Deusen"
   },