fix: trim pyproject description to PyPI 512-char Summary limit

Original description was 545 chars (33 over the PyPI Core Metadata
Summary cap of 512), causing 400 Bad Request on twine upload.

Trimmed internal-facing framing (Wave 1 deferral note, private
gateway reference) which doesn't belong in a PyPI Summary anyway.
Final length: 428 chars. The retained description still names every
primitive surface and the cross-language byte-parity claim against
agent-passport-system npm v2.6.0-alpha.0.

Published: https://pypi.org/project/agent-passport-system/2.4.0a0/

Author: aeoess

pyproject.toml

@@ -5,7 +5,7 @@ build-backend = "hatchling.build"
 [project]
 name = "agent-passport-system"
 version = "2.4.0a0"
-description = "Python SDK for the Agent Passport System. Identity, delegation, governance, data source registration, training attribution, per-period attribution settlement, mutual authentication, evidentiary type safety (claim/evidence registry, claim verifier with forbidden-substitution detection, contestation cascade). Cross-language parity with agent-passport-system npm v2.6.0-alpha.0 verified by byte-identical canonical JSON fixtures. Wave 1 accountability primitives in JS SDK; Python port deferred. Product intelligence lives in the private gateway."
+description = "Python SDK for the Agent Passport System. Identity, delegation, governance, data source registration, training attribution, per-period attribution settlement, mutual authentication, evidentiary type safety (claim/evidence registry, claim verifier with forbidden-substitution detection, contestation cascade). Cross-language parity with agent-passport-system npm v2.6.0-alpha.0 verified by byte-identical canonical JSON fixtures."
 readme = "README.md"
 license = "Apache-2.0"
 requires-python = ">=3.9"