docs: add TEST-NEEDS.md (CRG C)

Author: hyperpolymath

TEST-NEEDS.md

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+# TEST-NEEDS.md — verisimiser
+
+## CRG Grade: C — ACHIEVED 2026-04-04
+
+## Current Test State
+
+| Category | Count | Notes |
+|----------|-------|-------|
+| Integration tests (Rust) | 2 | Dual compiled binaries (debug + release) |
+| Verification tests | Unit-level | `verification/tests/` directory present |
+| FFI tests | Present | `src/interface/ffi/test/` |
+
+## What's Covered
+
+- [x] Dual integration test builds
+- [x] FFI verification layer
+- [x] Cargo test harness
+
+## Still Missing (for CRG B+)
+
+- [ ] Property-based verification testing
+- [ ] Fuzzing for edge cases
+- [ ] Benchmarking suite
+- [ ] Multi-target platform tests
+
+## Run Tests
+
+```bash
+cd /var/mnt/eclipse/repos/verisimiser && cargo test
+```