Reduce Linear tracker reads in serve

[yvette-carlisle]

Summary

• reduce control-plane snapshot run metadata hydration to active runs only
• cache repeated stale worktree recovery probes that lack Decodex active ownership
• add regression coverage for terminal publish metadata skips and recovery skip caching

Verification

• cargo +nightly fmt --all -- --check
• cargo make check-vstyle-rust
• cargo test -p decodex operator_state_snapshot_publish -- --nocapture
• cargo test -p decodex recovery_skip_cache_suppresses_repeated_unowned_worktree_lookup -- --nocapture
• cargo test -p decodex --lib --quiet
• cargo make check-rust