Move specialized skills to skill-data/ so npx skills add only finds one (#1227)

The skills CLI metadata.internal flag was never implemented (PRs #587
and #652 were both closed). All 6 skills were showing in the installer.

Move the 5 specialized skills (dogfood, electron, slack, vercel-sandbox,
agentcore) from skills/ to skill-data/, which the skills CLI does not
search. The bootstrap skill stays in skills/ for discovery. The Rust CLI
searches both directories so agent-browser skills list/get still serves
all 6.

skill-data/dogfood/templates/dogfood-report-template.md

@@ -0,0 +1,53 @@
+# Dogfood Report: {APP_NAME}
+
+| Field | Value |
+|-------|-------|
+| **Date** | {DATE} |
+| **App URL** | {URL} |
+| **Session** | {SESSION_NAME} |
+| **Scope** | {SCOPE} |
+
+## Summary
+
+| Severity | Count |
+|----------|-------|
+| Critical | 0 |
+| High | 0 |
+| Medium | 0 |
+| Low | 0 |
+| **Total** | **0** |
+
+## Issues
+
+<!-- Copy this block for each issue found. Interactive issues need video + step-by-step screenshots. Static issues (typos, visual glitches) only need a single screenshot -- set Repro Video to N/A. -->
+
+### ISSUE-001: {Short title}
+
+| Field | Value |
+|-------|-------|
+| **Severity** | critical / high / medium / low |
+| **Category** | visual / functional / ux / content / performance / console / accessibility |
+| **URL** | {page URL where issue was found} |
+| **Repro Video** | {path to video, or N/A for static issues} |
+
+**Description**
+
+{What is wrong, what was expected, and what actually happened.}
+
+**Repro Steps**
+
+<!-- Each step has a screenshot. A reader should be able to follow along visually. -->
+
+1. Navigate to {URL}
+   ![Step 1](screenshots/issue-001-step-1.png)
+
+2. {Action -- e.g., click "Settings" in the sidebar}
+   ![Step 2](screenshots/issue-001-step-2.png)
+
+3. {Action -- e.g., type "test" in the search field and press Enter}
+   ![Step 3](screenshots/issue-001-step-3.png)
+
+4. **Observe:** {what goes wrong -- e.g., the page shows a blank white screen instead of search results}
+   ![Result](screenshots/issue-001-result.png)
+
+---