Add comprehensive security, E2E, and fuzz tests; update project state

[hyperpolymath]

Summary

This PR adds three major test suites (security, end-to-end, and property-based fuzz tests) to close critical verification gaps identified in the MVP scope. It also updates project documentation to reflect the current state and clarifies the narrow scope of v0.1.0.

Key Changes

New Test Suites

• test/security_test.exs (403 lines): Comprehensive security testing covering:

  • Request sanitization (exotic HTTP methods, null bytes, path traversal, oversized paths)
  • Header handling and trust spoofing prevention (X-Trust-Level stripping, security response headers)
  • SSRF resistance (proxy target validation, Host/X-Forwarded-Host isolation)
  • Capability token validation (SafeTrust parsing, trust hierarchy monotonicity, access decision matrix)
  • 30+ individual test cases

• test/e2e_test.exs (532 lines): End-to-end lifecycle testing covering:

  • Full request pipeline (load → compile → enforce → proxy)
  • Policy hot-reload with atomic swaps and failure recovery
  • Upstream proxy behavior (502 on backend unavailable, 503 on missing policy)
  • Health and readiness probes (/health, /ready)
  • Request ID propagation and auto-generation
  • 25+ test cases exercising real plug pipeline

• test/fuzz_test.exs (277 lines): Property-based fuzz testing using StreamData:

  • Arbitrary HTTP method strings (never crashes, always valid response)
  • Arbitrary trust level strings (always parse safely to valid atoms)
  • Arbitrary paths through gateway (never crashes)
  • Arbitrary valid policies (always compile without crashing)
  • Combined method + path + trust fuzzing (50+ runs per property)

Documentation Updates

• ROADMAP.adoc: Expanded with MVP scope definition, explicit list of what the gateway does and does NOT do, and proof requirements matrix
• STATE.adoc: New file documenting current version (0.1.0-dev), CRG grade (C), module inventory (19 Elixir modules, 2 Zig FFI, 2 Idris2 ABI), and test coverage status
• TEST-NEEDS.md: Updated to reflect new test suites (security_test.exs, e2e_test.exs, fuzz_test.exs)
• .machine_readable/STATE.a2ml: Updated version and phase to reflect pre-release verification stage
• IMPLEMENTATION-ROADMAP.md: Marked as historical; directs readers to canonical documents

Project Metadata

• mix.exs: Version bumped from "1.0.0" to "0.1.0-dev" to reflect pre-release status
• tests/fuzz/placeholder.txt: Removed (replaced by real test/fuzz_test.exs)

Notable Implementation Details

1. Security tests use realistic attack vectors: SQL injection payloads, null bytes, path traversal sequences, oversized inputs, and trust spoofing attempts—all handled gracefully without crashes.

2. E2E tests exercise the real plug pipeline: Not mocked; tests the full gateway stack including rate limiting, trust extraction, policy lookup, and proxy forwarding.

3. Fuzz tests are property-based: Uses ExUnitProperties with StreamData generators to explore the input space systematically. Generators include both valid and adversarial inputs (e.g., 5000-char paths, regex injection attempts).

4. Policy hot-reload tests verify atomicity: Confirms that failed recompilation preserves the last good policy, and that route additions/removals take effect immediately.

5. Trust hierarchy is formally validated: Tests confirm monotonicity (higher trust never loses access) and exhaustive coverage of the 3×3 access decision matrix.

6. All tests are async: false to avoid race conditions during policy swaps and shared state mutations.

Test Coverage Summary

• Security: 30+ tests covering OWASP-relevant attack surface
• E2E: 25+ tests

https://claude.ai/code/session_01TzU2xW8y2uBCaCm2mE4NUV

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