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/scripts/analytics/tests/fixtures/bom-export.csv

@@ -0,0 +1,9 @@
+"Content","Date","Impressions","Reactions","Comments","Shares","Clicks"
+"The uncomfortable truth about AI governance in public sector. Most organizations are focused on...",2026-01-28,4523,87,23,12,156
+"3 frameworks I use daily for evaluating AI tools before recommending them to government...",2026-01-26,2891,54,18,8,94
+"Why 80% of AI projects fail in public sector (and what the 20% do differently)...",2026-01-24,8712,192,45,31,287
+"Just spent 3 hours debugging a Copilot Studio flow. The issue? A single missing...",2026-01-22,1543,32,41,5,67
+"Hot take: The best AI strategy for 2026 isn't about AI at all. It's about...",2026-01-20,6234,143,67,28,198
+"I asked 50 government employees about their biggest AI challenge. The #1 answer surprised...",2026-01-17,5891,128,89,19,234
+"Unpopular opinion: Low-code/no-code platforms are actually harder than they look. Here's why...",2026-01-15,3456,76,34,11,123
+"The meeting that changed how I think about AI adoption in large organizations...",2026-01-13,2198,48,22,7,89

plugins/linkedin-studio/scripts/analytics/tests/fixtures/empty-export.csv

@@ -0,0 +1 @@
+"Content","Date","Impressions","Reactions","Comments","Shares","Clicks"

plugins/linkedin-studio/scripts/analytics/tests/fixtures/european-export.csv

@@ -0,0 +1,3 @@
+"Content";"Date";"Impressions";"Reactions";"Comments";"Shares";"Clicks"
+"The uncomfortable truth about AI governance...";"28.01.2026";"4.523";"87";"23";"12";"156"
+"3 frameworks I use daily...";"26.01.2026";"2.891";"54";"18";"8";"94"

plugins/linkedin-studio/scripts/analytics/tests/fixtures/sample-export.csv

@@ -0,0 +1,9 @@
+"Content","Date","Impressions","Reactions","Comments","Shares","Clicks"
+"The uncomfortable truth about AI governance in public sector. Most organizations are focused on...",2026-01-28,4523,87,23,12,156
+"3 frameworks I use daily for evaluating AI tools before recommending them to government...",2026-01-26,2891,54,18,8,94
+"Why 80% of AI projects fail in public sector (and what the 20% do differently)...",2026-01-24,8712,192,45,31,287
+"Just spent 3 hours debugging a Copilot Studio flow. The issue? A single missing...",2026-01-22,1543,32,41,5,67
+"Hot take: The best AI strategy for 2026 isn't about AI at all. It's about...",2026-01-20,6234,143,67,28,198
+"I asked 50 government employees about their biggest AI challenge. The #1 answer surprised...",2026-01-17,5891,128,89,19,234
+"Unpopular opinion: Low-code/no-code platforms are actually harder than they look. Here's why...",2026-01-15,3456,76,34,11,123
+"The meeting that changed how I think about AI adoption in large organizations...",2026-01-13,2198,48,22,7,89