fix: reject invalid idempotency TTLs and secure generated apps

[kang-heewon]

Summary

• Reject non-positive, fractional, non-finite, unsafe, and Date-overflowing idempotency TTLs with a stable InvalidIdempotencyTtlProblem before pruning or state mutation.
• Preserve omitted TTLs as non-expiring records and cover coordinator propagation, hostile numeric inputs, and mutation-order regressions.
• Keep generated Next.js applications on patched framework releases and force PostCSS 8.5.12 in root, generated workspaces, and the dependency-audit fixture. This adjacent security update is included because the publish-profile audit blocked this PR on GHSA-6g55-p6wh-862q.

Verification

• Full workspace tests: 226/226 tasks
• Full workspace typecheck: 225/225 tasks
• API docs drift check: 112/112 builds; tracked output matches
• Problem registry: 447/447
• Public API snapshots: 111
• Dependency audit policy: passed
• Independent adversarial review: approved with no findings

Fixes #1403

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 491f1219-6148-4b9b-9f51-b279018c0b78

📥 Commits

Reviewing files that changed from the base of the PR and between 72fbcd0 and f9ce99b.

⛔ Files ignored due to path filters (2)

• packages/problems-core/src/generated/problem-code-registry.ts is excluded by !**/generated/**
• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (21)

• .changeset/secure-next-template-server-actions.md
• .changeset/valid-idempotency-ttl.md
• docs/problem-code-registry.json
• packages/create-croco-app/src/tests/NextTemplateSecurity.spec.ts
• packages/create-croco-app/templates/blank/pnpm-workspace.yaml
• packages/create-croco-app/templates/spa-be-split/pnpm-workspace.yaml
• packages/docs/src/content/docs/api/idempotency-core/src/classes/InvalidIdempotencyTtlProblem.md
• packages/docs/src/content/docs/api/idempotency-core/src/type-aliases/IdempotencyTtlConstraint.md
• packages/docs/src/content/docs/api/idempotency-core/src/type-aliases/InvalidIdempotencyTtlProblemOptions.md
• packages/docs/src/content/docs/api/idempotency-core/src/variables/IDEMPOTENCY_DIAGNOSTIC_CODES.md
• packages/docs/src/content/docs/api/problems-core/src/variables/CROCO_PROBLEM_CODE_REGISTRY.md
• packages/docs/src/content/docs/en/reference/problem-recovery-cookbook.md
• packages/idempotency-core/src/index.ts
• packages/idempotency-core/src/libs/InMemoryIdempotencyStore.ts
• packages/idempotency-core/src/libs/problems/IdempotencyProblems.ts
• packages/idempotency-core/src/tests/IdempotencyCoordinator.spec.ts
• packages/idempotency-core/src/tests/InMemoryIdempotencyStore.spec.ts
• pnpm-workspace.yaml
• public-api-surface.snapshot.json
• scripts/dependency-audit-policy.mts
• tsconfig/contract-strict.baseline.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/1403-idempotency-ttl-validation

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[github-actions]

📊 Benchmark Results

✅ All benchmarks passed

Benchmark	p75	Threshold	Baseline	vs Baseline	Status	Notes
CrocoApp constructor	8.3μs	30.0ms	8.2μs	+1.4%	✅	-
CrocoApp lambdaHandler (10 controllers)	270.4μs	50.0ms	258.4μs	+4.6%	✅	-
Lambda cold-start simulation	445.4μs	80.0ms	418.1μs	+6.5%	✅	-
Lambda cold-start with headers	395.7μs	80.0ms	369.7μs	+7.1%	✅	-
Lambda cold-start with binary body	368.3μs	80.0ms	339.1μs	+8.6%	✅	-
Lambda cold-start with query params	315.4μs	80.0ms	301.3μs	+4.7%	✅	-
Lambda cold-start with authorizer context	314.4μs	80.0ms	299.8μs	+4.9%	✅	-
Lambda cold-start realistic scenario	313.9μs	80.0ms	299.2μs	+4.9%	✅	-
EventBusConfig.start (10 handlers)	1.5μs	10.0ms	1.4μs	+4.2%	✅	-
EventPublisher.publishNow single event	1.7μs	2.0ms	1.7μs	+2.4%	✅	-
DefaultHandlerResolver.resolve × 10	0.1μs	5.0ms	0.1μs	+0.0%	✅	-
Container.get singleton (cold)	75.7μs	5.0ms	70.3μs	+7.7%	✅	-
Container.register × 50 components	3.4ms	10.0ms	3.2ms	+3.9%	✅	-
Container.validate (50 components)	3.8ms	20.0ms	3.4ms	+12.7%	✅	-
Container.get singleton (warm)	1.6μs	500.0μs	1.6μs	+0.6%	✅	-
TelemetryRuntime.init (lambda preset)	2.3μs	200.0ms	1.1ms	-99.8%	✅	-
lambdaPreset config creation	1.5μs	2.0ms	1.4μs	+7.8%	✅	-

_{Updated: 2026-07-24T05:28:52.031Z · Commit: a97bfc7}

[kang-heewon]

CI blocker (unrelated to #1403): the publish verification profile now fails dependency-audit-policy because the generated Next.js templates pin 15.5.18, which is affected by newly published GHSA-89xv-2m56-2m9x, GHSA-m99w-x7hq-7vfj, and GHSA-p9j2-gv94-2wf4. The policy reports 18 blocking generated-app paths. GitHub lists 15.5.21 as the patched 15.x release.

The failure reproduces locally with pnpm security:audit-policy. All #1403 implementation checks and the other PR checks pass. I am not mixing the unrelated template-wide security upgrade into this idempotency PR or bypassing the required check.