Add campaign Decision History and capture workflow

[Jammy2211]

Campaign decisions currently disappear into task and project history. Add a flat Decision History disclosure immediately below Results, with named links opening canonical GitHub Markdown records in a new tab. Both boards can reference one record spanning repositories and datasets.

The existing check-in procedure now recognizes “record this decision”: summarize campaign context, cited evidence, alternatives, the human choice, implications and revisit conditions. Preserve superseded decisions. Empty indexes are intentional; the example NNLS title is not fabricated as a real decision.

Scripts Changed

• Dashboard renderer and new decisions reader/index: validated URLs, IDs/dates, local record consistency, escaped labels and stable newest-first order.
• CLI check validates the index and detects stale HTML/Markdown; refresh triggers include decision-only changes.
• CHECKIN.md, decision record template/reference, regression tests and generated boards.

Validation checklist

• 183 tests, Ruff/format and offline checks.
• Chromium: cross-organ record links/new-tab targets, native collapsed disclosure, mobile layout and existing interactions.
• Actual captured dashboard witness; no fabricated entries.
• Independent review CLEAN, including malformed/stale index and refresh behavior.
• Heart STALE only: release validation incomplete: no rehearsal for current source.

Refs #21. Approved glance plan, merge on green with witness; paired organ PR and no library dependency. Decisions record human choices without authorizing compute or implementation.