[karolko9]

Summary

settle.ts holds over 1,400 lines, and every new /settle code made it grow. This moves the reason
table to its own file, before task 0141 adds a code to it (#182 stacks on this).

 apps/facilitator/src/settlement/
+├── reasons.ts   # SETTLE_REASONS, UNSENT_REASONS, UNSENT, NOT_SIGN_AGAIN (moved verbatim)
 └── settle.ts    # 1409 → 1245 lines

Importers of SETTLE_REASONS (3 source files, 8 test files) now import it from reasons.ts.
UNSENT and NOT_SIGN_AGAIN gain export, since settle.ts reads them from the new file.

Evidence

Lines added that were not moved (move purity check, whitespace-insensitive):

export const NOT_SIGN_AGAIN = new Set<string>([
export const UNSENT = new Set(UNSENT_REASONS);
import { NOT_SIGN_AGAIN, SETTLE_REASONS, UNSENT, UNSENT_REASONS } from "./reasons.js";
import { PAYER_AUTH_REASON, UNSUPPORTED_CREDENTIAL_REASON } from "./verify.js";
import { SETTLE_REASONS } from "…/reasons.js";            (11 importers)
import { createSettler, … } from "…/settle.js";          (5 importers, SETTLE_REASONS dropped)

• Before / after: facilitator tests 1012 passed | 3 skipped, no test assertion changed; typecheck,
  lint and format clean.

Merge Danger

Door: two-way

Blast Radius: none

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