[Richard-LZ-Zhang]

The shared Stream previously selected between raw and decoded parsing hooks, while connection status changes were split between the receive loop and a generic status helper. This change gives each adapter one raw-frame entry point and makes lifecycle transitions update their related state before publishing status events.

Changes:

• Keep start() and clarify that it schedules receiving without waiting for connection, subscriptions or book readiness. Give the receiver task and receive loop descriptive names.
• Replace status() with private connection/gap/resync/error operations; retain a separate status emitter for construction and venue-specific redaction. WebSocket and gRPC loops use the same explicit lifecycle operations.
• Make WebSocket handle_raw(raw) -> list[Event] the sole parsing contract. Adapters own framing, decoding and native/Python fallback. Preserve gRPC's decoded-message hook.
• Rename the optional connection factory to websocket_connection_opener across adapters and tests.
• Move attribute explanations above assignments across the SDK. The first commit isolates comment-only edits; the second contains the Stream refactor, affected tests and migration documentation in docs/streaming.md.

Validation against experimental base 1dc1999 and SDK head 7a71bd9:

• Native streaming/adapter/parity suite: 324 passed, 3 optional-protobuf skips. The 323 sandbox-safe cases and loopback reconnect case were run separately because the sandbox blocks listening sockets.
• Forced-Python streaming suite: 257 passed, 70 skipped (67 native-only cases and 3 optional-protobuf cases).
• Feed, combo-warmer and server integration tests: 77 passed.
• All 73 nonfunctional Python-file changes preserve executable ASTs and real module/class/function docstrings after removing only standalone explanatory strings.
• Independent in-session reviews covered lifecycle/cancellation, adapter compatibility, native fallback, credential redaction, performance and maintainability. No unresolved findings. Added migration guidance after review.
• git diff --check passed. No live venue or account execution tests were run.

Compatibility: the approved constructor/hook/status renames require custom subclasses and diagnostic callers to migrate as documented. This PR targets codex/order-lifecycle-storage; it does not merge the experiment into public main or change release/version pins. MarketDataStream/UserDataStream separation, immutable public books, change waiting and queue-policy redesign remain outside this PR.

Review limitation: automatic approval rejected the optional external Codex CLI review because it would export repository content. No external CLI review was run; the in-session reviews above completed.