test: migrate to TestRelay fixture pattern and add compliance docs

- Remove unnecessary 'nix' dev dependency (Unix syscalls crate, not needed)
- Migrate announcement tests to new TestRelay fixture pattern
- Delete legacy test files (announcement_tests.rs, test_relay.sh)
- Add comprehensive test documentation (docs/how-to/test-compliance.md)
- Update README.md with new test commands
- All 18 integration tests passing (NIP-01 + NIP-34)

Benefits:
- Automatic relay lifecycle management
- No manual setup required
- Pure Rust integration tests
- Better developer experience
- CI/CD ready

1 files changed, 20 insertions, 13 deletions

diff --git a/README.md b/README.md
index 0d454bc..2418d14 100644
--- a/README.md
+++ b/README.md
@@ -129,17 +129,28 @@ We have two test suites:
 # Run unit tests (no external dependencies)
 nix develop -c cargo test --lib
 
-# Run integration tests (tests our relay implementation)
-# First, start ngit-grasp relay in one terminal:
-NGIT_BIND_ADDRESS=127.0.0.1:7000 nix develop -c cargo run
+# Run all integration tests (automatic relay management)
+nix develop -c cargo test --test nip01_compliance --test nip34_announcements
 
-# Then in another terminal, run integration tests:
-nix develop -c cargo test --test announcement_tests --ignored
+# Run NIP-01 compliance tests
+nix develop -c cargo test --test nip01_compliance
 
-# Or use the test script (starts relay automatically):
-./test_relay.sh
+# Run NIP-34 announcement tests
+nix develop -c cargo test --test nip34_announcements
+
+# With detailed output
+nix develop -c cargo test --test nip01_compliance -- --nocapture
+
+# Run specific test
+nix develop -c cargo test --test nip01_compliance test_nip01_smoke
 ```
 
+**Integration tests automatically:**
+- Start a fresh relay instance
+- Run compliance tests using grasp-audit library
+- Clean up when done
+- No manual relay management needed!
+
 **2. GRASP Audit Tool (grasp-audit)**
 
 The audit tool tests GRASP compliance of any relay (including ours or external ones).
@@ -151,12 +162,8 @@ cd grasp-audit
 # Run unit tests
 nix develop -c cargo test
 
-# Test against our ngit-grasp relay:
-# First, start ngit-grasp (in another terminal):
-cd .. && NGIT_BIND_ADDRESS=127.0.0.1:7000 nix develop -c cargo run
-
-# Then run audit:
-nix develop -c cargo run -- --url ws://127.0.0.1:7000
+# Test against any relay (including external ones)
+nix develop -c cargo run -- --url wss://relay.example.com
 
 # Or test against any external relay:
 nix develop -c cargo run -- --url wss://relay.example.com