feat(skills): PostHog cloud team skills — read path

[k11kirky]

Problem

Users have no way to browse or inspect skills that their team has published to PostHog cloud. Without visibility into team-shared skills, there's no path to discovering and installing them locally.

Changes

Adds a Team Skills tab to the Skills view that surfaces skills published by the team to PostHog cloud. The tab is conditionally shown only when the org has the team-skills feature enabled (gated server-side via a 403 response).

• Added API client types (LlmSkill, LlmSkillListItem, LlmSkillResolveResponse, etc.) and four new methods: listLlmSkills, getLlmSkillByName, resolveLlmSkill, and getLlmSkillFile.
• Introduced TeamSkillsService (injectable singleton) that fetches the team skill listing, filters to latest versions only, and cross-references local skill names to mark which skills are already installed.
• Registered skillsCoreModule in the desktop DI container.
• Added useTeamSkills, useTeamSkillDetail, and useTeamSkillFile React Query hooks.
• Built TeamSkillsTab, TeamSkillsSection, and TeamSkillDetailPanel components. The detail panel shows the SKILL.md body rendered as Markdown, a file tree for companion files, and a read-only code editor for non-Markdown files. Skills already installed locally are badged as Installed.

How did you test this?

Unit tests were added for TeamSkillsService.listTeamSkills covering: feature unavailability (API returns null), correct mapping and local-install marking, and filtering out non-latest versions.

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

[k11kirky]

• refactor(skills): apply simplify-pass cleanups across the stack #2612
• feat(skills): Codex unification — bring your skills, use them anywhere #2611
• feat(skills): publish skills to the team and install team skills locally #2610
• feat(skills): PostHog cloud team skills — read path #2609 👈 (View in Graphite)
• feat(skills): skills.sh marketplace browse and install #2608
• feat(skills): validation and shadowing signals #2607
• feat(skills): live refresh from the filesystem #2606
• feat(skills): create, edit, and delete user and repo skills #2605
• feat(skills): render full skill directories #2604
• main

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[github-actions]

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_{Reviewed by React Doctor for commit f478aff.}

[greptile-apps]

Prompt To Fix All With AI

Fix the following 2 code review issues. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 2
packages/ui/src/features/skills/SkillsView.tsx:116-131
**Orphaned tab state when `teamAvailable` flips**

The "Team" `TabsTrigger` is only rendered when `teamAvailable` is true, but `tab` state is never reset if `teamAvailable` becomes false while the user is already on the team tab (e.g., after the 60-second stale refetch returns a 403). The content branch `tab === "team" && teamAvailable` then silently falls through to the installed-skills view with no tab appearing active, leaving the user seeing one view but no highlighted tab label to indicate what they're looking at. Consider resetting `tab` to `"installed"` when `teamAvailable` transitions from `true` to `false`, or at minimum ensuring the guard also resets `tab` state.

### Issue 2 of 2
packages/core/src/skills/teamSkillsService.test.ts:25-29
**Mock uses `as unknown` cast instead of typed partial**

`makeClient` casts with `as unknown as PostHogAPIClient`, bypassing TypeScript checks entirely. The project convention is to include all required properties so the compiler still validates the mock's shape. For a class this large, a typed helper like `Partial<PostHogAPIClient>` cast to the type, or using a library utility (e.g., `vi.mocked`), keeps the intent clearer and avoids future drift if `PostHogAPIClient` changes its method signatures.

_{Reviews (1): Last reviewed commit: "feat(skills): PostHog cloud team skills ..." | Re-trigger Greptile}

[k11kirky]

Merge activity

• Jun 12, 11:31 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jun 12, 11:32 AM UTC: Graphite couldn't merge this pull request because a downstack PR feat(skills): create, edit, and delete user and repo skills #2605 failed to merge.
• Jun 12, 11:54 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jun 12, 12:37 PM UTC: Graphite rebased this pull request as part of a merge.
• Jun 12, 12:47 PM UTC: @k11kirky merged this pull request with Graphite.