fix: include parent_run_id in batch patch payload

Fix batch patch 422 by requiring trace_id and dotted_order in UpdateRunBatched

Security hardening: HTTPS enforcement, response limits, URL escaping, input validation

Fix eval semaphore goroutine leak and Submit/Close item-loss race

Audit fixes: Close race, map aliasing, header injection, flush retry, CSV retry

Remove hardcoded version from README install instructions

Add release version badge to README

Pin installation to v0.1.0 in README

Audit fixes: shutdown race, backoff cap, lazy batch, URL escaping, panic recovery

Audit fixes: batch context, retry logic, eval robustness, URL escaping

Fix module path: rename tcoooper to ty-cooper

Audit fixes: thread-safety, error handling, testing, and README

Implement LangSmith Go SDK based on Python SDK reference

Initial commit