fix(quota): preserve visible Goal settlement source

[huangruiteng]

Summary

• derive quota spend attribution from the typed scheduler runtime profile
• keep native Goal runtimes on source=visible-goal without heartbeat Todo/Turn bindings
• preserve the existing typed heartbeat settlement plan and record the reusable self-repair pattern

Root cause

The canonical visible Goal host command already used source=visible-goal, but the nested interaction contract hard-coded a heartbeat spend and the currently selected Todo. If the Todo completed before accounting, that stale binding could reject the spend or misattribute interactive usage.

Validation

• python -m pytest tests/control_plane/test_quota_settlement.py tests/control_plane/test_quota_settlement_cli.py tests/control_plane/test_scheduler_execution_context.py tests/test_host_loop_activation.py -q
• python examples/control_plane/interaction-contract-state-machine-smoke.py
• python examples/control_plane/quota-spend-agent-identity-smoke.py
• loopx canary premerge --from-git-diff
• loopx check public-boundary scan over all four changed files (clean)