merge dev: dockerignore Rust artifacts, cost tracker, image compressor close

fix: update test data for 3-element savings_history; document PrometheusMetrics divergence

fix: add request body parser regression tests

feat: gate /v1/compress with semaphore + shared thread pool

Avoid blocking proxy health routes during compression

fix: compress user and tagged messages by default

Revert "fix: offload compression to thread to prevent blocking /readyz"

fix: offload compression to thread to prevent blocking /readyz

Add live Redis multi-worker integration tests

fix(proxy): restore auto-compute pre-upstream concurrency

fix: use get_authorization_scheme_param for Bearer auth + skip /visualize and /dashboard

feat: switch proxy auth from X-Headroom-Key to Authorization: Bearer

fix(proxy): add API key auth and stabilize proxy tests

fix: route count_tokens to api.anthropic.com, not proxy base_url

fix(proxy): strip cache_control before hashing turn_id

test(proxy): cover turn_id branches flagged by codecov

docs(changelog): record turn_id feature; fix import order in new test

feat(proxy): emit turn_id linking agent-loop API calls from one user prompt

feat: add live transformations feed to dashboard