Restore dice assignment, fusion, and the commitment counterweights

The ship40 concept pipeline had reversed the proven a-series mechanisms:
the seed's roll decayed into a shortlist nomination that taste functions
(model ranking, candidate floor, simulated user) then argmaxed into the
safest card; the costume check returned as the Translation veto and
carrier-removal test; and the 07-15 rewrite deleted the calibration,
reflex-font lanes, color strategies, and commit-every-atom language that
had held off the cream-editorial default since the alpha era. Five of six
frozen craft directions converged on the same warm-paper family and both
builders obeyed them.

This lands the repair on top of the in-progress simplification:

- new-work.md: the script assigns the build index again on both scopes;
  catalog challengers are fused (challenger supplies form and grammar,
  product supplies every fact, clarity wins conflicts) and weighed on the
  two proven axes only; attended runs present one fully committed
  direction with re-roll and an optional steer instead of a ranked
  lineup; the color-strategy picker, reflex-face list, saturated-look
  calibration, first-viewport thesis and memory test, commit-every-atom,
  scroll pacing, and prove-don't-claim return; the direction contract
  returns as five lean blocks audited by the separate-agent finish.
- concept-seed.mjs: PROMOTED INDEX becomes ASSIGNED INDEX with
  build-assignment semantics; self re-roll only on named factual grounds.
- craft-floor.md: hook-active sessions act on findings instead of
  re-auditing; the Refuse list is framed as category defaults the brief
  can earn; a closing commitment line keeps a ban list from being the
  last word before code.
- codex.md / shape.md: contract references restored for flow coherence.

Adopts the concurrent session's ceremony cuts, softened challenger
instruction, seed SOURCE IDs and --candidate-count, detector-ownership
fix, and the removal of the hook-side contract audit (the audit now
belongs to the separate reviewer at finish).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

skill/reference/codex.md

@@ -21,7 +21,7 @@ Show the probes together and ask what should carry forward, what feels false to
 
 Do not begin code until the user approves a direction or explicitly delegates the choice. If they delegate, choose using the task brief, PRODUCT.md, and DESIGN.md, and state the evidence. Approval refines the task concept; it does not modify DESIGN.md.
 
-After approval, summarize the composition and the parts of the comp that must not be literalized. Return to new-work.md and write the direction contract from the approved surface concept before code.
+After approval, summarize the composition and the parts of the comp that must not be literalized. Return to new-work.md, record the direction contract from the approved surface concept, then build.
 
 ## Inventory implementation fidelity
 
@@ -35,4 +35,4 @@ Treat the comp as a north star, not something to trace. Do not rasterize core UI
 
 When clean raster ingredients are required and a scoped subagent is available and authorized, use `impeccable_asset_producer`. Give it the approved comp, output paths, required dimensions and formats, transparency needs, crop notes, and what must remain semantic code. Otherwise produce the minimum required assets with the native image-generation capability in the current thread.
 
-Return to [new-work.md](new-work.md) for the direction contract, implementation, and finishing pass.
+Return to [new-work.md](new-work.md) for the direction contract, implementation, and the finishing pass.