parliament_lookup_by_column

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USE THIS TOOL WHEN you have an OSCOLA-style Hansard citation (column + volume + house) and need the debate. Example input: 'HL Deb 14 Oct 2025, vol 849, col 200'. AFTER calling, read the contribution at the cited column via read_resource(uri="hansard://debate/{debate_ext_id}/header") — or, equivalently, call parliament_get_debate_contributions(debate_ext_id) for the full list as a structured tool response. Each match carries: - `contribution_count` — real contribution count from the debate's Items - `source` / `source_code` — citation finality (1=Rolling, 2=Daily, 3=BoundVolume, 4=Historic). Resolution is NOT gated on publication state. Empty `matches` typically means the volume_number is wrong (opposing counsel sometimes cites running-volume rather than bound-volume) or the column is in a Written Statement (use the 'W'-suffixed column as-is). It does NOT mean the citation is fabricated — surface the failure. Authoritative source for OSCOLA Hansard column resolution.