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>

CHANGELOG.md

@@ -5,6 +5,22 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.0.0] - 2026-05-29
+
+### Summary
+**Plugin renamed `linkedin-thought-leadership` → `linkedin-studio`** ("LinkedIn Thought Leadership" → **LinkedIn Studio**). The old display title read as pompous; the new name is plain and matches how the plugin already describes itself ("LinkedIn content engine"). This is a **breaking change** — the marketplace slug, the agent namespace (`linkedin-studio:<agent>`), and the runtime state-file path all change — so it bumps to a major version. Functionality is byte-for-byte identical to v2.4.0; this release is pure identity.
+
+### Changed (breaking)
+- **Slug / directory / manifests:** `plugins/linkedin-thought-leadership/` → `plugins/linkedin-studio/`; `plugin.json` and root `marketplace.json` `name`/`source` updated. **Reinstall required.**
+- **Agent namespace:** commands invoke plugin agents as `linkedin-studio:<name>` (was `linkedin-thought-leadership:<name>`). Functional change in `commands/newsletter.md`; docs updated to match.
+- **Runtime state path:** `~/.claude/linkedin-thought-leadership.local.md` → `~/.claude/linkedin-studio.local.md`. Hardcoded in `hooks/scripts/{state-updater,session-start,posting-reminder,user-prompt-context}.mjs`, `hooks/prompts/topic-rotation-gate.md`, and `config/state-file.template.md`. **Existing state migrated in place** (post metrics, streak, content history preserved).
+- **Catch-all skill** `skills/linkedin-thought-leadership/` → `skills/linkedin-studio/` (frontmatter `name: linkedin-studio`); the five functional skills (`linkedin-analytics`, `-content-creation`, `-networking`, `-strategy`, `-voice`) are unchanged.
+
+### Not changed (explicit non-deltas)
+- **Command namespace `/linkedin:*`** — set per-command in frontmatter (`name: linkedin:post`), already independent of the plugin slug. Every command (`/linkedin:post`, `/linkedin:newsletter`, …) is invoked exactly as before. 24 commands, 16 agents — counts unchanged.
+- **All hooks, scripts, renderers, agent contracts, content** — bit-for-bit identical to v2.4.0.
+- **History preserved:** `config-audit` v5.0.0 test snapshots and the `docs/` build artifacts retain the old slug as point-in-time records and were intentionally not rewritten.
+
 ## [2.4.0] - 2026-05-29
 
 ### Summary