Add bounded Level power-plan pilot

[epowell40]

Summary

• extend exact Level scope materialization into a bounded read-only power-plan inspection runtime
• persist per-view inventory, exact-ID summaries, visual-frame evidence, assumptions, and next actions
• fail closed on truncation, wrong scope, incomplete readback, or more than two pilot views

Verification

• focused semantic/scope/runtime suites: 17/17
• full public backend: 941 passed, 3 skipped (944 total)
• tool contracts: 195/195/195; skills manifest: 21
• live Revit 2024 Sidecar pilot: session 8ed32df6-0c86-4ae5-bd1e-dd93727e5b32, exact views 1363337 and 1645258, no model writes