OpenClaw plugin fixes, telemetry fix, cost tracker improvement, tokenBudget support

Fix CI: guard starlette imports, asyncio.run(), deprecate datetime.utcnow()

Add quality retention eval and fix linting for Python 3.12

Fix all mypy type errors and flaky embedding test

Fix all ruff lint and format errors for CI

Publish headroom-ai v0.2.0 to PyPI with DevEx fixes

feat: Add CCR architecture, TOIN telemetry, and DevEx improvements

Add cache optimization module with scalable dynamic content detection

Prepare for OSS release v0.2.0

Initial commit: Headroom SDK - LLM context optimization toolkit