feat(transport): add TransmissionPlan and summary frame identity

[zzylol]

Stacked on #475.

Establishes the physical transport contract:

• adds TransmissionPlan to the atomic PhysicalPlan bundle and active immutable snapshot
• emits one exact producer/materialization/schema rule with mode, encoding, cadence, checkpoint policy, and destination
• embeds each Collector transmission subset in its CollectorPlan
• defines versioned SummaryFrameIdentity with plan/version, materialization, schema, producer epoch, canonical series fingerprint, window, sequence, encoding, and checkpoint lineage
• carries frame identity in reserved asap.frame.* data-point attributes without leaking them into PromQL labels
• validates the complete OTLP summary-frame batch before SID registration, store mutation, snapshot mutation, or worker routing
• validates active plan/version, registered producer, schema, wire encoding, materialization, series identity, and the complete full-state payload
• returns HTTP 422 / non-OK gRPC for a rejected batch; HTTP 2xx / gRPC OK is the delivery ACK
• keeps full-frame retries idempotent through the same SID/labels/window replacement; no second application ACK or transport WAL protocol
• selects msgpack for heap-bearing frequency states so heap contents are not lost

Validation:

• cargo check -p control_plane -p data_plane
• cargo test -p control_plane physical::compiler::tests --lib --quiet (10 passed)
• cargo test -p data_plane summary_frame_identity_is_parsed_and_removed_from_series_labels --lib --quiet (1 passed)
• git diff --check

This PR is intentionally open and must follow #475.