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Backend: - Add router.param middleware in issues, activity, and agents routes to resolve identifiers (e.g. PAP-39) to UUIDs before handlers run - Simplify GET /issues/:id now that param middleware handles resolution - Include identifier in getAncestors response and issuesForRun query - Add identifier field to IssueAncestor shared type Frontend: - Update all issue navigation links across 15+ files to use issue.identifier ?? issue.id instead of bare UUIDs - Add URL redirect in IssueDetail: navigating via UUID automatically replaces the URL with the human-readable identifier - Fix childIssues filter to use issue.id (UUID) instead of URL param so it works correctly with identifier-based URLs - Add issueUrl() utility in lib/utils.ts Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>