refactor(remote-connect): move wire poll contracts

[limityan]

Summary

• Move remote-connect command/response wire DTOs, model catalog DTOs, poll response assembly, and model-catalog delta policy into bitfun-services-integrations.
• Keep bitfun-core as the product execution adapter for ImageContextData, dispatcher routing, session restore execution, file IO/path resolution, and terminal pre-warm.
• Add owner-crate contract tests and boundary-script checks so these wire/poll policies do not drift back into core.
• Update AGENTS and decomposition docs to reflect the completed remote-connect wire/poll owner slice and the remaining runtime boundary.

Behavior Guardrails

• No CLI/Desktop/Remote/ACP product surface behavior changes are intended.
• Remote message execution, workspace/session restore execution, file reads, terminal pre-warm, and dialog submission routing remain core-owned.
• The added model-catalog delta test preserves the existing invalidation behavior when the client knows an old catalog version but the current catalog cannot be loaded.
• This PR does not move ToolUseContext, concrete tools, product-domain runtime, or feature matrix/default feature behavior.

Validation

• node scripts/check-core-boundaries.mjs
• cargo test -p bitfun-services-integrations --features remote-connect --test remote_connect_contracts -- --nocapture
• cargo check -p bitfun-core --features product-full
• cargo test -p bitfun-core remote_ -- --nocapture
• cargo check -p bitfun-services-integrations --features product-full
• git diff --check