feat(model-router): wave 2-B — orchestrators declare phases, shifters and pins removed, frontmatter = off-state floor

The 15 Skill(effort-*) citers now call mcp__model-router__route per phase
(orchestrate at a dispatch span, reflect/plan for the skill's own level,
apply at the bookkeeping tail, escalate at the verify-secure caps); built-in
judgment dispatches carry an explicit effort= param. lib/effort-shift.md is
the route doctrine, lib/model-gate.md the mod rule (route answer = witness,
/route on as remedy). Deleted: skills/effort-*, lib/effort-pins.txt/.sh,
lib/model-check.sh, their tests, the installers' re-apply blocks. The mod
drops its Skill(effort-*) bridge. The tracked model:/effort: frontmatter
stays as the off-state floor, census-locked equal to the rows
(lib/tests/effort-routing.test.sh rewritten, 140 checks; analyzer → xhigh).

Contract .claude/tasks/contracts/2026-10-10-model-router-w2b-1045.md, plan
r4 § W2-B: GATE 0 MET, verifier ECARTS(7) then CONFORME 10/10, security
PASS, full make test green (design-tool-gate env red only).

agents/commit-changer.md

@@ -10,7 +10,7 @@ effort: high
 
 > MODEL (BDR-077): `MODE: propose` is dispatched with `model="opus"` (the
 > call-site override — narrative reconstruction + capitalize routing are
-> judgment); `MODE: apply` runs on the sonnet frontmatter pin (mechanical
+> judgment); `MODE: apply` runs on its sonnet row (frontmatter = off-state floor; mechanical
 > staging/committing of an approved plan).
 
 Reconstruct the development narrative from a working directory. The goal