test(crg-c): add TEST-NEEDS.md — 31 unit + 3 integration tests

Was missing assessment file despite having real tests. Grades to C.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: hyperpolymath

TEST-NEEDS.md

@@ -0,0 +1,38 @@
+# TEST-NEEDS.md — idrisiser
+
+## CRG Grade: C — ACHIEVED 2026-04-04
+
+## Current Test State
+
+| Category | Count | Notes |
+|----------|-------|-------|
+| Integration tests (Rust) | 3 | `tests/integration_test.rs` |
+| Unit tests (Rust, `#[test]`) | 31 | Across `src/` modules |
+| Fuzz tests | 0 | `tests/fuzz/` directory present but empty |
+
+## What's Covered
+
+- [x] `manifest::init_manifest` — creates `idrisiser.toml` in a temp dir
+- [x] `manifest::load_manifest` + `validate` — roundtrip against example manifest
+- [x] `validate` rejects empty project name
+- [x] 31 unit test annotations across source modules (codegen, ABI, etc.)
+
+## CI Gate
+
+```bash
+cargo test
+```
+
+## Known Failures / Limitations
+
+- `tests/fuzz/` exists but contains no fuzz targets
+- Integration tests depend on `examples/user-api/idrisiser.toml` — if that
+  example is removed, tests break
+- No property-based tests
+
+## Still Missing (for CRG B+)
+
+- [ ] Fuzz targets for manifest parsing
+- [ ] Tests for the Idris2 codegen output (verify generated `.idr` files)
+- [ ] CI job independent of parent repo
+- [ ] 6+ diverse external targets (CRG B requirement)