index_diagnostics_webview

Summary

An editor webview panel displays index timing diagnostics for the active base.
Capabilities:
- Base / latest-run summary: total time, file counts, average depth
- Drill into recent runs
- Rank files by duration ( slowest first ); show outcome and path depth
Opened by command `reqlan.openIndexDiagnostics` ( open_index_diagnostics ).
Optional entry from workspace index health ( workspace_pane ) may link later; command is the primary entry.
Implementation: index-diagnostics-panel.ts, App.svelte.

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