Brings up to the 1.1.0 release.

• atomicmemory.contract.v1 — a wire codec for the v1 provider contract's mixed-case encoding, with the vendored JSON Schemas, conformance corpus, and a two-direction pytest harness proving the SDK both accepts and emits v1 wire shapes.
• content_class on every ingest mode — extraction-based ingests (text/messages) can now satisfy a core running the default RAW_CONTENT_POLICY=reject; still never defaulted.
• Lifecycle hardening — client initialize() is concurrency-safe, idempotent, and sticky on failure; services stage provider registrations atomically with best-effort teardown.

See CHANGELOG.md for the full 1.1.0 notes.