Explain the matching root cause instead of citing the duplicate's report ID

[manuelconcari-ai]

The Duplicate template in references/triage-comment-templates.md puts the other report's identifier in the comment body: This issue matches an existing report with the same root cause and impact: **<report-id>**.

The repository forbids that elsewhere. The comment-templates skill states "Never reference other report IDs in the comment body — reporters cannot see them"; its own Duplicate template asks instead for one sentence "without referencing the other report's ID"; the handoff output rules repeat it for client summaries; and the recorded triage mistakes list the same thing as a mistake to avoid.

Replace the identifier with a short standalone explanation of the confirmed matching root cause, taken only from facts already verified in the current report. That also satisfies the recorded rule that a duplicate comment must address the specific finding in the report it answers rather than a generic reason.

Only the Duplicate section of that file changes: 1 file, +6/−3. The draft comment goes from three sentences to two, which is what the bulk-triage skill asks for and the current template does not meet. The acknowledgment, the Duplicate decision, the other templates, and the triage skill's confirmation requirement before add_comment are untouched. Internal dup-{id} labels are unaffected: they are not part of the comment body.

Validation: the patch applies and reverses at main 60d8813 with --whitespace=error-all, changes only that file, and the cited sources were checked against that commit. No agent run, deployed template, platform access control, or actual disclosure was tested.