Release v0.5.1: upgrade vendor SDKs and harden evolution workflow

[ebarti]

Release

• prepares package version 0.5.1 and the matching uv.lock root metadata
• adds complete release notes for changes since v0.5.0 to CHANGELOG.md
• validates wheel and sdist metadata with strict Twine checks
• verifies a clean Python 3.10 wheel install/import as agent-runtime-kit==0.5.1

Summary

• upgrade Claude Agent SDK from 0.2.128 to 0.2.148
• upgrade OpenAI Codex SDK and its coupled CLI binary from 0.144.4 to 0.147.0
• upgrade Google Antigravity SDK from 0.1.8 to 0.1.15 and normalize short public session IDs to provider-safe conversation UUIDs
• remove repository and ambient UV freshness cooloffs from the evolution workflow
• repair candidate discovery so upstream releases are discovered independently of current dependency bounds
• inspect exact baseline/candidate APIs, semantic adapter behavior, and recent upstream implementation changes in credential-scrubbed disposable environments
• make the direction-of-travel output report implementation trends instead of dependency recommendations
• gate dependency application and PR publication on exact lock targets, complete behavior evidence, architecture review, and repository verification

SDK state

Package	Before	After
claude-agent-sdk	0.2.128	0.2.148
openai-codex	0.144.4	0.147.0
openai-codex-cli-bin	0.144.4	0.147.0
google-antigravity	0.1.8	0.1.15

The standalone Codex CLI binary 0.149.0 was inspected as an opaque upstream artifact but is not selected: openai-codex 0.147.0 requires CLI binary 0.147.0 exactly.

Validation

• no-cooloff report-only run across all four monitored packages: behavior pass, architecture safe, independent review pass
• env -u UV_EXCLUDE_NEWER -u UV_EXCLUDE_NEWER_PACKAGE uv lock --check
• env -u UV_EXCLUDE_NEWER -u UV_EXCLUDE_NEWER_PACKAGE uv run --locked ruff check .
• env -u UV_EXCLUDE_NEWER -u UV_EXCLUDE_NEWER_PACKAGE uv run --locked mypy
• env -u UV_EXCLUDE_NEWER -u UV_EXCLUDE_NEWER_PACKAGE uv run --locked pytest -q --cov=agent_runtime_kit --cov-report=term-missing --cov-fail-under=85
• 519 passed, 8 skipped; 90.45% coverage
• git diff --check

Generated evolution reports remain gitignored and local.