Refactor: share version-library grouping and bumpPatch

Extracts the per-key version grouping + same-version dedupe (org-owned shadows
builtin) into lib/versionedLibrary.groupVersions and the semver patch bump into
lib/semver.bumpPatch, both of which were duplicated byte-for-byte across the
Skills and Agent-profiles pages. One source of truth so the two libraries can't
drift.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/src/pages/SkillsPage.tsx

@@ -19,6 +19,8 @@ import { Sheet, SheetContent, SheetDescription, SheetHeader, SheetTitle } from '
 import { Textarea } from '@/components/ui/textarea'
 import { MarkdownEditor } from '@/components/MarkdownEditor'
 import { api } from '@/lib/api'
+import { bumpPatch } from '@/lib/semver'
+import { groupVersions } from '@/lib/versionedLibrary'
 import { useAuth } from '@/store/auth'
 
 interface ActionDto {
@@ -106,19 +108,6 @@ const emptyForm = (): FormState => ({
   goldenTests: [],
 })
 
-/** Bump the last numeric segment of a semver-ish string (1.0.0 → 1.0.1). */
-function bumpPatch(version: string): string {
-  const parts = version.split('.')
-  for (let i = parts.length - 1; i >= 0; i--) {
-    const n = Number(parts[i])
-    if (Number.isInteger(n)) {
-      parts[i] = String(n + 1)
-      return parts.join('.')
-    }
-  }
-  return `${version}.1`
-}
-
 const csv = (s: string): string[] =>
   s.split(',').map((x) => x.trim()).filter(Boolean)
 
@@ -175,26 +164,8 @@ export function SkillsPage() {
     void load()
   }, [load])
 
-  // Group every version under its key; newest (and the org's own) first comes from the API order.
-  const groups = useMemo(() => {
-    const byKey = new Map<string, SkillSummary[]>()
-    for (const s of skills) {
-      const list = byKey.get(s.skillKey) ?? []
-      list.push(s)
-      byKey.set(s.skillKey, list)
-    }
-    // If an org has forked a builtin but kept the same version, the org's own copy shadows the builtin
-    // (it's the one that runs and the one you can edit), so the picker shows one clear, editable entry.
-    for (const [key, list] of byKey) {
-      const perVersion = new Map<string, SkillSummary>()
-      for (const s of list) {
-        const existing = perVersion.get(s.version)
-        if (!existing || (existing.origin === 'Builtin' && s.origin !== 'Builtin')) perVersion.set(s.version, s)
-      }
-      byKey.set(key, [...perVersion.values()])
-    }
-    return [...byKey.entries()].sort((a, b) => a[0].localeCompare(b[0]))
-  }, [skills])
+  // Group every version under its key (org-owned shadows a same-version builtin). See groupVersions.
+  const groups = useMemo(() => groupVersions(skills, (s) => s.skillKey), [skills])
 
   // Read-only details: reconstruct the SKILL.md and render it. Works for builtins too — inspect a
   // skill (frontmatter, prompt body, actions, golden tests) without forking or versioning it.