refactor(linkedin)!: rename plugin linkedin-thought-leadership → linkedin-studio (v3.0.0)

BREAKING CHANGE: the marketplace slug, the agent namespace
(linkedin-studio:<agent>), and the runtime state-file path
(~/.claude/linkedin-studio.local.md) all change. Reinstall required;
existing state migrated in place (post metrics, streak, history preserved).
The /linkedin:* commands are unchanged — the command namespace is set
per-command in frontmatter and was always independent of the plugin slug.
Functionality is byte-identical to v2.4.0; this release is pure identity.

- dir + manifests: plugins/linkedin-studio + plugin.json + root marketplace.json
- agent namespace updated in commands/newsletter.md (only functional invoker)
- state path updated in 4 hook scripts + topic-rotation prompt + state template
- catch-all skill dir renamed skills/linkedin-studio (5 functional skills unchanged)
- docs + version bump to 3.0.0 across README badge, CHANGELOG, root README/CLAUDE.md
- historical records (CHANGELOG past entries, docs/ build artifacts,
  config-audit v5.0.0 snapshots) intentionally retain the old slug

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

agents/content-repurposer.md

@@ -37,7 +37,7 @@ ${CLAUDE_PLUGIN_ROOT}/references/newsletter-strategy-guide.md      → newslette
 ${CLAUDE_PLUGIN_ROOT}/references/thought-leadership-angles.md      → 8 universal angles
 ${CLAUDE_PLUGIN_ROOT}/assets/case-studies/case-study-template.md   → case study structure + 4 LinkedIn post angles
 ${CLAUDE_PLUGIN_ROOT}/assets/examples/high-engagement-posts.md     → proven patterns to replicate
-~/.claude/linkedin-thought-leadership.local.md                     → user state + performance data
+~/.claude/linkedin-studio.local.md                     → user state + performance data
 ```
 
 ## Step 1: Source Content Analysis