Migrate legacy research record status columns

[Techris93]

Summary

• migrate long-lived research_subjects, research_evidence, and research_iocs tables to the active/retracted lifecycle
• preserve all existing rows with active as the non-null default
• restore Mission Control Research Cases reads on the pilot SQLite database
• add an exact legacy-schema regression fixture and checkpoint documentation

Verification

• 394 Core tests passed, 14 existing warnings, 4 subtests passed
• MkDocs strict build passed
• live Research Cases endpoint returns HTTP 200
• all eight scoped registry monitors completed with zero failures

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Migrate legacy research_rules before indexing status

For a long-lived database that already has a legacy research_rules table without the lifecycle status column, init_db() still fails before reaching this loop because the earlier CREATE INDEX idx_research_rules_case_type ON research_rules (case_id, rule_type, status) references the missing column. This leaves Research Cases broken for legacy deployments with detection rules; include research_rules.status in the migration and run that migration before creating indexes that depend on it.

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