v1.0.0

First stable release. No behavioral changes from 0.15.0 — this release marks
the public API surface as stable for semantic versioning.

Added

• LICENSE file (MIT) — declared in pyproject.toml since 0.1.0 but not
  shipped as a file; now included at repo root and in both wheel
  (dist-info/licenses/LICENSE) and sdist artifacts (#42).
• README.md — install, sync + async quickstart, env-var auth, demo vs
  production, public/unauthenticated usage, order placement, WebSocket
  streaming, error hierarchy, retry policy, pagination (#41).
• docs/RELEASING.md — one-time PyPI trusted-publisher setup runbook plus
  cut-a-release procedure.
• .github/workflows/release.yml — tag-triggered release pipeline:
  tag/version drift check, uv build, twine check, PyPI publish via
  trusted publishing (OIDC, no token in repo secrets), GitHub Release
  with CHANGELOG-extracted body and artifacts attached (#15).
• [project.urls] extended from 3 → 6 keys (Issues, Changelog,
  PyPI); Documentation retargeted to README anchor (#44).

Changed

• Development Status classifier bumped from 3 - Alpha to
  5 - Production/Stable (#43).

Coverage at 1.0.0

• 89/89 REST endpoints implemented (sync + async). 67 with live
  integration tests; 20 SDK+unit only; 2 auth-gated (demo cannot
  authenticate); 1 demo-broken (server-side).
• 12 WebSocket message types dispatched with spec-aligned envelope and
  payload types. 14 integration tests; 3 frame types live-verified.
• 899 unit tests, mypy --strict clean, ruff clean, contract drift
  tests on query/path/body/WS-payload schemas.