bump to 0.5.76 — propagate litellm CVE exclusion to all users

security: exclude compromised litellm versions 1.82.7 and 1.82.8

fix: api and session header changes

small changes

feat: add simulate_agent example with Gemini 2.5 Flash

feat: enterprise client improvements

fix: normalizer tweak for trace tap

fix: LangSmith tap only intercepts _update_run to avoid duplicate grading

fix: trace tap lint fixes and normalizer improvements

fix: improve LangSmith tap to hook multipart tracing (_create_run/_update_run)

feat: add trace tap — intercept LangSmith/Langfuse traces and forward to Synkro

docs: rewrite introduction page to lead with simulation

fix

docs: rewrite all docs and README with agent simulation framework positioning

docs: update tagline to "AI agent simulation framework"