Initial snapshot: Aliro applet, harness, Nucleo NFC10A1 reader port

Three components, all bench-validated to varying depths:

- applet/: CSA Aliro v1.0 Java Card applet for J3R180. AUTH0 + AUTH1
  expedited-standard flow end-to-end green via PC/SC bench reader
  (aliro-bench-test). Userland AES-256-GCM and HMAC-SHA-256 layered
  on top of J3R180's primitives because the card lacks both natively.
  P-256 curve params seeded explicitly per J3R180's quirk.

- harness/: Python orchestrator (aliro-trustgen, aliro-personalize,
  aliro-bench-test) for trust-bundle generation, card personalization
  via PersonalizationApplet, and PC/SC AUTH0+AUTH1 transactions. 126
  pytest cases passing.

- reader/STM32CubeExpansion_ALIRO_V1_0_0/: ST X-CUBE-ALIRO V1.0.0
  with our NFC10A1 port (NUCLEO-U545RE-Q + X-NUCLEO-NFC10A1, ST25R200
  shared with NFC09A1). nfc10-only/ project, NFC10A1 BSP shim,
  ALIRO_TRUST_OVERRIDE include into vendor's provisioning.c, and an
  ALIRO_APDU_TRACE wrapper around demoTransceiveBlocking. Boots,
  detects the J3R180, completes SELECT + AUTH0; AUTH1 currently fails
  with RFAL ERR_PROTO (0xB) — under investigation, see
  docs/plans/2026-04-20-nucleo-nfc10a1-port.md and bench-notes/.

Excluded: x-cube-aliro.zip vendor archive, harness/.venv, build dirs,
generated aliro_trust.h (contains private reader scalar), all PEMs.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

harness/tests/test_ca.py

@@ -0,0 +1,39 @@
+from cryptography import x509
+from cryptography.hazmat.primitives.asymmetric import ec
+
+from aliro_harness.issuer.ca import create_self_signed_ca
+
+
+def test_create_self_signed_ca_returns_p256_cert_and_key():
+    cert, key = create_self_signed_ca(common_name="Test Credential Issuer CA")
+
+    assert isinstance(cert, x509.Certificate)
+    assert isinstance(key, ec.EllipticCurvePrivateKey)
+    assert key.curve.name == "secp256r1"
+
+
+def test_self_signed_ca_subject_and_issuer_match():
+    cert, _ = create_self_signed_ca(common_name="Test Credential Issuer CA")
+
+    assert cert.subject == cert.issuer
+    cn = cert.subject.get_attributes_for_oid(x509.NameOID.COMMON_NAME)[0].value
+    assert cn == "Test Credential Issuer CA"
+
+
+def test_self_signed_ca_has_ca_basic_constraints():
+    cert, _ = create_self_signed_ca(common_name="Test CA")
+
+    bc = cert.extensions.get_extension_for_class(x509.BasicConstraints)
+    assert bc.value.ca is True
+    assert bc.critical is True
+
+
+def test_self_signed_ca_signature_verifies_with_own_key():
+    cert, key = create_self_signed_ca(common_name="Test CA")
+
+    public_key = key.public_key()
+    public_key.verify(
+        cert.signature,
+        cert.tbs_certificate_bytes,
+        ec.ECDSA(cert.signature_hash_algorithm),
+    )