MBA-715: Implement session management and NIST 800-53 IA-11 compliant re-authentication

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MBA-715: Implement session management with NIST 800-53 IA-11 compliance

Summary

This PR implements standalone session management classes for the USPTO Patent Public Data project, creating the foundation for session lifecycle management that can integrate with future web frameworks (Part 1.1) and authentication systems (Part 1.2).

The implementation adds 20+ Java classes organized into four packages under gov.uspto.session.*:

Session Model & Management: Core Session entity with NIST IA-11 compliance fields, SessionManager orchestrator, SessionStore interface with InMemorySessionStore implementation, SessionFactory, and SessionValidator.

Re-authentication: ReauthenticationPolicy for configurable policies, ReauthenticationTrigger for event handling, PrivilegeChangeDetector (placeholder for Part 1.2), and SessionTimeoutManager for timeout-based re-auth.

Security: SessionIdGenerator using SecureRandom for cryptographically secure IDs, SessionEncryption with AES/GCM for sensitive data, SessionHijackingPrevention with IP/User-Agent binding, and SessionToken for token representation.

Lifecycle: SessionCreationService, SessionTerminationService, SessionRenewalService, and ConcurrentSessionManager for managing concurrent sessions per user.

Added BouncyCastle 1.70 dependency for cryptographic operations.

Review & Testing Checklist for Human

• Cryptographic implementation review: Verify SessionEncryption.java AES/GCM implementation - check IV generation (12 bytes), tag length (128 bits), key handling, and that the encrypt/decrypt cycle is secure
• Session ID security: Review SessionIdGenerator.java - verify SecureRandom usage and that the isValidSessionIdFormat method correctly handles prefixed IDs with Base64 URL encoding (which uses _ characters)
• Session hijacking prevention logic: Review subnet masking in SessionHijackingPrevention.java - the default uses /24 subnet comparison which may be too permissive or restrictive depending on use case
• Thread safety: Verify InMemorySessionStore and ConcurrentSessionManager handle concurrent access correctly
• NIST IA-11 compliance: Confirm the re-authentication triggers (time-based, privilege escalation, security attribute changes) meet organizational requirements

Recommended test plan: Run mvn test -pl Common -Dtest="gov.uspto.session.**" to execute all 73 session management tests. Review test coverage for edge cases in encryption and session validation.

Notes

• These are standalone classes designed for future integration with Part 1.1 (Core Framework) and Part 1.2 (Authenticator Management)
• The PrivilegeChangeDetector contains placeholder methods that will need implementation when Part 1.2 is available
• Java 8 compatibility was verified - replaced List.of() with Collections.singletonList() and Optional.isEmpty() with !Optional.isPresent()

Link to Devin run: https://app.devin.ai/sessions/956471a358924eb59362bd288558e7fb
Requested by: Jake Cosme (jake@cognition.ai) / @jakexcosme

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