feat(event): score TDT tracks with pair precision and switch rate

[seonghobae]

Summary

#38 merged to protected main (4d287a2). Preferred merge #45 was draft+CONFLICTING after that merge. This cycle rebased #45 onto origin/main (kept mention SQL from #38 and 0007 retention), force-pushed ed1349f, and marked it ready. #45 is MERGEABLE BLOCKED: Checks queued, CodeRabbit COMMENTED only, no qualifying independent APPROVE. Do not self-approve or force-merge. Do not leapfrog #45 with #39.

Next no-0008 gap: TDT tracking pair precision/recall and identity-switch rate in existing event_core (does not recreate TDT/CHRONOS or model_selection crates, does not wait on #48/#49/#53/#65/#66/#67, and does not allocate 0008).

• refuse_track_as_instance / refuse_track_as_transition never promote a hypothesized track
• tracking_pair_precision and tracking_pair_recall fail closed on empty, mismatched, duplicate-mention, or pairless assignment streams
• tracking_identity_switch_rate is computed only over consecutive mentions that share a truth track
• Computed RMSE of known same-track pair targets is lower under calibrated scores than under an always-one-track detector

Test plan

• RED: pair-precision fixture initially failed (0.5 vs 0.5 always-one-track); fixture corrected so calibrated precision exceeds the naive merge
• cargo test -p event_core --offline
• cargo clippy -p event_core --all-targets --offline -- -D warnings
• cargo test --workspace --offline
• python3 scripts/validate_documentation.py and check_docstrings.py
• event_core line 144/144 and branch 40/40
• exact-head required Checks (do not treat queued evidence as passed)

Do not self-approve or merge. Prefer merge #45 when exact-head required checks and a qualifying independent APPROVE exist. Do not allocate 0008.

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