chore(OUT-4005): test typecheck CI + stale test-type fixes [4/4]

[SandipBajracharya]

Stack 4/4 — base: OUT-4005-split-3

Adds yarn typecheck:test (tsc over test/tsconfig.json) and a CI job so type errors in tests gate PRs — the main tsconfig excludes test/, so nothing typechecked tests before. Fixes the pre-existing type errors it surfaces (missing bankAccountRef fixtures, stale UnitPrice input, string status/id) and loads the ambient shims in test/tsconfig. Adds CLAUDE.md.

Part of the OUT-4005 payout-reconciliation stack:

1. schema + migration
2. reconciliation service + deposit lookup
3. webhook + resync wiring
4. typecheck tooling + chore ← this PR

🤖 Generated with Claude Code

[linear-code]

OUT-4005

[vercel]

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Project	Deployment	Actions	Updated (UTC)
quickbooks-sync	Building		Aug 3, 2026 8:35am
quickbooks-sync (dev)	Ready	Preview	Aug 3, 2026 8:35am

[greptile-apps]

Greptile Summary

Adds test-file typechecking as a required pull-request CI job.

• Adds the typecheck:test package script and GitHub Actions job.
• Loads the tracked intuit-oauth ambient declaration without loading the missing generated or dependency-backed declarations reported previously.
• Updates stale test fixtures and inputs to satisfy current application types.
• Adds repository development guidance in CLAUDE.md.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
test/tsconfig.json	Restricts test typechecking to test TypeScript files and the tracked, self-contained Intuit ambient declaration; both previously reported declaration-loading failures are absent.
.github/workflows/test.yml	Adds an isolated pull-request job that installs dependencies and runs the new test typecheck command.
package.json	Adds a TypeScript no-emit command using the dedicated test configuration.
test/integration/quickbooks/invoicePaid/frozenIntentRouting.test.ts	Removes stale status fixture overrides so the tests use the current seed contract.
test/unit/utils/intuitAPI.responses.test.ts	Updates Intuit API fixtures and item input to conform to current types.

_{Reviews (3): Last reviewed commit: "chore(OUT-4005): add test typecheck scri..." | Re-trigger Greptile}

[SandipBajracharya]

@greptileai review whole PR again

[SandipBajracharya]

@greptileai review again

[priosshrsth]

lgtm