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/doc-syncer.md

@@ -60,8 +60,8 @@ audit, report, and patch.
 Parse `$ARGUMENTS`:
 
 - **`MODE: patch`** — the dispatcher approved a PATCH PLAN and re-dispatches
-  this agent to APPLY it. Jump to MODE: PATCH section. Runs on the sonnet
-  frontmatter pin.
+  this agent to APPLY it. Jump to MODE: PATCH section. Runs on its sonnet
+  row (frontmatter = off-state floor).
 - **`MODE: audit`** (or no explicit MODE — audit is the default) — analysis
   half, dispatched with `model: "opus"` (judgment tier; the call-site
   override takes precedence over the sonnet pin). **READ-ONLY: Write and