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>

plugins/linkedin-studio/config/content-history.template.md

@@ -0,0 +1,18 @@
+# Content History Log
+
+Tracks all LinkedIn posts created through the plugin. Append-only — never edit existing entries.
+
+Auto-initialized from `config/content-history.template.md` when the first post is logged.
+
+## Format
+
+| Date | Hook | Topic | Format | Words | Chars | Source |
+|------|------|-------|--------|-------|-------|--------|
+
+<!-- Entries are appended below by the Stop hook -->
+<!-- Format: | YYYY-MM-DD | "Hook text (60 chars max)..." | topic_area | post/quick/react/video | word_count | char_count | original/url/curated | -->
+
+## Content Log
+
+| Date | Hook | Topic | Format | Words | Chars | Source |
+|------|------|-------|--------|-------|-------|--------|