Add unified anomaly pipeline candidates

[NunotaKansuke]

Summary

• add Finder.run_anomaly_pipeline() as the one-call adopted-model workflow
• add unified ranked anomaly candidates with location, strength, provenance, and fit-exclusion status
• keep frozen residual measurement separate from accepted fit exclusion masks
• migrate RGES F146 JSON/HTML reporting to the unified candidate list
• document the API and align the package version at 0.5.3

Root cause addressed

A rejected post-physical continuation refit previously cleared its exclusion mask and caused the downstream feature detector to return no features, even when the frozen adopted-model residual contained a strong anomaly. The new pipeline always performs the frozen residual measurement and reports the resulting candidate independently.

Validation

• pytest -q — 193 passed
• Sphinx documentation build with -W
• Ruff checks
• git diff --check
• RMDC26_000142 end-to-end verification: one unified candidate at BJD 2461660.3904841 with 45.88 sigma strength