feat(habit): wire durable runtime and HTTP workflow

[seonghobae]

Summary

Implements #42 as the next production slice of #36.

• requires a validated PostgreSQL URL and bounded pool settings before creating the Habit runtime
• injects PostgresHabitRepository through NestJS instead of process-local storage
• closes the PostgreSQL pool idempotently through application shutdown hooks
• exposes versioned tenant-scoped endpoints for habit creation/listing, bounded occurrences, idempotent completion, and immutable history
• validates UUIDv4 workspace and habit identifiers, exact request shapes, recurrence discriminators, dates, timestamps, and idempotency keys
• maps validation, not-found, idempotency-conflict, persistence, and unexpected failures to credential-free RFC 9457-compatible problem details
• adds runtime, HTTP-boundary, and controller coverage for configuration bounds, shutdown, recurrence workflows, tenant isolation, exact replay, and safe failure responses
• documents configuration ownership, deployment migration requirements, temporary workspace-header trust, deferred authenticated authorization, and rollback behavior

Deferred

Authenticated workspace derivation, database-aware readiness, deployment-time migration locking, network-level HTTP integration tests, and higher-level habit workflows remain separate reviewable slices.

Validation gate

Merge only when CI, AppGuardrail, Semgrep, Security Scan, Commercial Readiness, CodeRabbit, and all human/security review requirements pass on the exact head with no unresolved actionable findings.

Closes #42

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📥 Commits

Reviewing files that changed from the base of the PR and between cab995e and ec6aa02.

📒 Files selected for processing (11)

• .github/workflows/ci.yml
• apps/habit-service/migrations/README.md
• apps/habit-service/src/habit-http-boundary.test.ts
• apps/habit-service/src/habit-http-boundary.ts
• apps/habit-service/src/habit-http-controller.test.ts
• apps/habit-service/src/habit-http-controller.ts
• apps/habit-service/src/habit-runtime.test.ts
• apps/habit-service/src/habit-runtime.ts
• apps/habit-service/src/main.ts
• docs/superpowers/plans/2026-08-04-habit-postgres-runtime-slice.md
• package.json

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[seonghobae]

Superseded by #43, which now includes the same bounded runtime and strict HTTP boundary plus production-module network/PostgreSQL integration evidence, restart durability, credential-free failure coverage, and the capability-manifest evidence paths required for habit.recurring-core. Closing this duplicate to keep one authoritative review head.