Merge branch 'worktree-agent-a63474e92b05425a5'

# Conflicts:
#	Cargo.lock
#	Cargo.toml

tickets/015-logpreview-param-columns.md

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+# 015 — LogPreview: selectable parameter columns
+
+## Summary
+
+The README's LogPreview spec says it should be possible to pick which parameters are
+visible as columns, alongside the always-visible sequence/timestamp. Currently
+LogPreview only shows sequence, timestamp, and raw text.
+
+## Scope
+
+- Extend the logs API/DTO ([004](004-metrics-api.md) territory, but specifically the
+  existing `GET /api/logs`) to include derived param values per log line, sourced
+  from [001](001-param-declarations.md)'s declarations applied to that line.
+- Frontend: column picker UI in/near LogPreview; selected columns persist (localStorage
+  is fine for a per-viewer preference, or fold into settings if it should be shared —
+  pick localStorage unless product direction says otherwise).
+
+## Acceptance criteria
+
+- Declared params with a match on a given log line appear as selectable, populated
+  columns in LogPreview.
+- Column selection persists across a page reload.
+
+## Depends on
+
+- [001 — Param declarations](001-param-declarations.md)
+- [004 — Metrics API](004-metrics-api.md) (for the pattern of extending log query
+  responses)