Complete Data query postprocessing and history

[czyt]

Summary

• Deliver bounded Data query completion events and owner-fenced durable history for success, error and cancellation.
• Run typed-result assertions, extractions and post-response scripts once per completed successful query; withhold file-backed rows/diagnostics and oversized bodies from saved history.
• Show processing results and a direct history link in the Data workbench, with a readable narrow-screen history table.

Verification

• Application CI 38860888606: source, full check/release build and PostgreSQL/MySQL database jobs passed.
• Local Data client, protocol, database and frontend suites passed; 390px remote CSV query and history navigation inspected in the browser.
• Independent branch review found five issues; fixes and regression tests are included.

Remaining gates

• Per-query pre scripts, saved dataset production, extra source formats and EDAS validation are separate work.
• Platform build 38847423656 still has a Linux AppImage linuxdeploy failure and queued macOS jobs; this PR does not claim package parity.