feat(routing): W1 no-inherit — fable skill-runners, opus review dispatches, dispatch-tier doctrine (BDR-077)

No dispatched agent inherits the session model anymore:
- client-handover-writer's 7 general-purpose skill-runner dispatch sites
  carry model: "fable" (+ normative rule; spike-verified alias — resolves
  claude-fable-5, enum-validated, loud failure, never silent fallback)
- ship-feature STEP 6 + init-project STEP 10 code-review dispatches carry
  model: "opus" (was: inherit — the leak the maps exposed)
- model-gate.md §4: dispatch-tier doctrine (typed = frontmatter pin,
  built-ins = explicit model= at every call site)
- census §12 (66 pass), make test green

skills/init-project/SKILL.md

@@ -223,7 +223,10 @@ against the founding contract. Distinct axis from STEP 10 code review
 ([[LRN-095]]) — both run.
 
 ## STEP 10 — CODE REVIEW
-Invoke `superpowers:requesting-code-review`. Fix all CRITICAL before proceeding.
+Invoke `superpowers:requesting-code-review`. **Model routing (BDR-077):** the
+review subagent it dispatches MUST carry `model: "opus"` in the Agent call —
+craft review is dispatched judgment, never inherited from the session. Fix
+all CRITICAL before proceeding.
 
 ## STEP 10b — CAPITALIZE FOUNDING DECISIONS (memory registries)
 A greenfield's founding architecture decisions are the highest-value BDRs — the