digest-aware serialized extraction + chain simplification replace the spine stage

Owner live-test verdict on the spine (2026-09-30): no perceptible gain —
the real problems (restatement nodes, shallow re-derivations, same
conclusion from many angles) are mint-time issues a post-hoc chain
minter cannot fix. This arc moves assembly INTO the extractor and adds
the deterministic dedupe the owner specified:

- Digest-aware extraction: each stretch's extractor prompt carries THE
  GRAPH SO FAR (its own source's merged propositions + chains, ids
  verbatim); build on existing ids instead of restating, lean on
  established conclusions as premises. Mixed-namespace chain endpoints
  (fresh p-ids OR existing n_-ids) validated at the submit seam.
- Serialized per source: a source's batches/chunks run strictly in
  order (each extract reads every earlier merge); cross-source runs
  stay parallel; source-wide abort stops the loop. The spine stage,
  role, phase, usage stage, cost row, and setup roster are gone.
- Core-ideas prompt: goal reframed as uncovering core ideas and showing
  how everything derives from the foundations; direction upward, prefer
  lean derivations, never re-derive what the graph already holds.
- Chain simplification (merger maintenance): simplifyChains drops
  provably redundant chains at every merge — prefer-fewest-premises +
  ancestry-cover ([A,B]⟹X with [X,C]⟹Y covers [A,B,C]⟹Y, transitive);
  same-key provenance lines drop together; rewriteLedgers under the
  audit lock; droppedChains counted separately in stats.

Chunk budget stays 8192 (owner: keep for now, maybe lower later).

components/setup-dialog.tsx

@@ -49,7 +49,7 @@ import type { ThinkingLevel } from "@earendil-works/pi-agent-core";
 /** The pickers' slot identity — same roster language as the Agent
  *  section's slot rows. */
 const SLOT_META: Record<ModelSlotName, { label: string; roster: string }> = {
-	strong: { label: "Strong", roster: "Prober, teacher, spine, practice trio" },
+	strong: { label: "Strong", roster: "Prober, teacher, practice trio" },
 	cheap: { label: "Cheap", roster: "Researcher, demo builder, extractor, auditor" },
 	vision: { label: "Vision", roster: "Visual maker + PDF reader" },
 };