refactor(ship): carve into skeleton + on-demand sections (Claude) (T9)

ship/SKILL.md drops 167KB → 68.7KB (~59% of the always-loaded skill) by moving
8 prose-heavy steps into ship/sections/*.md, read on demand:
tests, test-coverage, plan-completion, review-army, greptile, adversarial,
changelog, pr-body. Step 12's version logic now calls the tested
gstack-version-bump CLI instead of inline bash.

Claude-first (S2): {{SECTION:id}} emits a STOP-Read pointer on Claude (skeleton +
generated section files) and INLINES the content on every other host, so external
hosts keep the full monolith — verified factory at 162KB with no sections dir.
{{SECTION_INDEX:ship}} renders the situation→section table from the PASSIVE
manifest (CM2 / v2_PLAN.md:663); required-reads live only in test fixtures.
Multi-pass resolve expands inlined sections' own resolvers.

Parity: ship invariant flipped to sectioned (union content checks + maxSkeletonBytes
asserts the shrink). Carve-fallout fixed across gen-skill-docs/skill-validation/
golden/plan-completion/#1539/size-budget tests via skeleton+sections union reads.
Free suite green except the pre-existing investigate parity drift.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

scripts/resolvers/index.ts

@@ -34,6 +34,7 @@ import { generateGBrainContextLoad, generateGBrainSaveResults } from './gbrain';
 import { generateQuestionPreferenceCheck, generateQuestionLog, generateInlineTuneFeedback } from './question-tuning';
 import { generateMakePdfSetup } from './make-pdf';
 import { generateTasksSectionEmit, generateTasksSectionAggregate } from './tasks-section';
+import { SECTION, SECTION_INDEX } from './sections';
 
 export const RESOLVERS: Record<string, ResolverValue> = {
   SLUG_EVAL: generateSlugEval,
@@ -92,4 +93,6 @@ export const RESOLVERS: Record<string, ResolverValue> = {
   MAKE_PDF_SETUP: generateMakePdfSetup,
   TASKS_SECTION_EMIT: generateTasksSectionEmit,
   TASKS_SECTION_AGGREGATE: generateTasksSectionAggregate,
+  SECTION,
+  SECTION_INDEX,
 };