refactor(remote-connect): move service agent runtime assembly

[limityan]

Summary

• Move remote model catalog config-shape assembly into bitfun-services-integrations while core only projects config facts and keeps config/session resolver ownership.
• Move dialog scheduler outcome assembly into the remote-connect owner contract while core still owns scheduler execution, restore, terminal pre-warm, and workspace/persistence reads.
• Update boundary checks and core decomposition docs so future work does not treat these read-side owner moves as runtime lifecycle migration.

Safety / behavior boundary

• No Cargo dependency or feature changes.
• No changes to remote command/response wire shape, scheduler submit order, terminal pre-warm behavior, restore behavior, workspace-root source, or persistence reads.
• New contract tests pin catalog version clamping, capability/reasoning wire values, default/session model fields, and scheduler started/queued outcome mapping.

Verification

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