refactor(types): move type clusters to leaves; types.ts becomes a pure barrel

[lidge-jun]

Summary

Stack (merge bottom-up):

#	PR	Layer	Review focus
2	this	type clusters -> leaves ← you are here	name inventory + import edges
1	#2019	value clusters -> leaves	runtime identity

Depends on #2019. Review this PR's diff only.

Layer 2 of the mega-file split program (devlog/_plan/260818_megafile_split_program). src/types.ts (1727 lines) becomes a 103-line pure barrel; every type cluster moves to a type-only leaf:

• src/types/request.ts (352) — replay identity, OcxParsedRequest, messages/content, OcxRequestOptions, AdapterEvent, usage/citation.
• src/types/config.ts (812) — OcxClaudeCodeConfig, desktop profiles, storage/custom-model/api-key, OcxConfig, combos, routing profiles, token guardian, sidecar configs.
• src/types/provider.ts (515) — RefreshPolicy (relocated from the config cluster: its only consumer is OcxProviderConfig.refreshPolicy, and leaving it would create a config<->provider type cycle), OpenRouter routing, item-id repair, retry/pacing, FastWire/AttemptTierOutcome/TierObservationContext/TierDecision, OcxProviderConfig. Two inline import("./adapters/cursor/...") type queries rewritten to ../adapters/cursor/....
• src/types/accounts.ts (28) — CodexAccount records.

The two runtime value re-export blocks from layer 1 (tools + wire) stay in the barrel unchanged, so the runtime import graph is untouched: the protected responses/core.ts -> types -> types/tools edge is identical, and type-only leaves are erased. Named re-exports only — no export * (would duplicate runtime names).

Independently audited twice (grok-4.6, gpt-5.6-sol) before implementation; audits corrected cluster boundaries, caught 3 missing dependency edges (request->provider tier types, config->accounts CodexAccount, the RefreshPolicy cycle) and the cursor path rewrites. Recipe recorded in devlog 020_wp1b_type_clusters.md.

Verification

At head b2ac250 on the remote validation host (Linux):

• bun run test: 13,201 pass / 15 skip / 0 fail across 840 files (495.6s) — pass count identical to layer 1's baseline, proving zero behavior change
• tests/core-lab-boundary.test.ts: 13 pass
• bun run typecheck: exit 0
• Duplicate-declaration check: every moved name declared in exactly one leaf

Checklist

• Stacked on refactor(types): extract value clusters into types/tools and types/wire leaves #2019 (base codex/split-wp1-types); retarget to dev after parent lands
• Full suite green (shared runtime file)
• No user-facing behavior change; no docs-site update needed
• privacy:scan green on parent; no new logging introduced

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[github-actions]

⚠️ Deterministic hygiene checks failed.

• missing_regression_test — Behavior changed under src/ or gui/src/ without a test change. Add focused coverage or obtain test-exception-approved.

[github-actions]

⏳ DRAFT

• hygiene: missing_regression_test.

What to do

• Fix missing_regression_test — Behavior changed under src/ or gui/src/ without a test change. Add focused coverage or obtain test-exception-approved.

This pull request was already a draft. Its draft status will be preserved after every issue above is resolved.