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/edition-delingstekst.template.md

@@ -0,0 +1,55 @@
+<!--
+  TEMPLATE — edition-delingstekst.md  (distribution copy for a newsletter edition)
+
+  Purpose : the per-edition LinkedIn distribution text that render/build-linkedin.mjs
+            folds into each POST.html "all-in-one-place" deliverable. This is the
+            feed copy the reader sees BEFORE "…see more" — the hook that earns the
+            click (gated in /linkedin:newsletter Step 9).
+  Decision: G — production lives in the series root, NOT the plugin. Copy this to
+            <serie>/linkedin/edition-delingstekst.md and fill it in.
+  Location: <serie>/linkedin/edition-delingstekst.md  (cwd = series root).
+  Graceful: render/build-linkedin.mjs degrades if this file is missing (no
+            distribution copy is folded in; the article POST.html still builds).
+            Provide it for a complete delivery.
+
+  GRAMMAR (exactly what parseDelingstekst() recognizes — do not improvise):
+    - A section starts with a heading:  "## Del N — <title>"  (N = article number,
+      mapped to zero-padded key "0N")  OR  "## Samle <…>"  (the collected post,
+      key "samle").
+    - "## SYSTEM …" headings are ignored.
+    - Inside a section, until the next "## " heading or a "---" line:
+        * "**Første kommentar:** <text>"  → first-comment text (one line).
+        * a line beginning with "#" + non-space (e.g. "#KI #offentligsektor")
+          → the hashtag line.
+        * a "> …" blockquote line → ignored (use it for NB/notes to yourself).
+        * every other line → part of the share text (the hook + body shown in feed).
+  Keys MUST match the NN-prefix of the draft (NN-utkast.md) and edition-config.json.
+-->
+
+## Del 1 — <edition title>
+
+<First line = the krok/hook: the single line that must stop the scroll. Keep the
+strongest claim or tension here; this is what shows before "…see more".>
+
+<Then 2–4 short lines that pay off the hook and point at the article. Tighten,
+never pad — this is feed copy, not the article.>
+
+**Første kommentar:** <the first-comment text — e.g. a link, a question to seed
+discussion, or the "full edition here" pointer. LinkedIn suppresses links in the
+body, so the link belongs here.>
+
+#hashtag1 #hashtag2 #hashtag3
+
+> NB to self (ignored by the renderer): note any freshness caveat or A/B variant
+> you want to remember for this edition.
+
+---
+
+## Samle <collected-post title, if shipping a roundup of the series>
+
+<Hook for the collected/summary post. Same grammar. Omit this whole section if the
+edition has no samle post.>
+
+**Første kommentar:** <first comment for the samle post>
+
+#hashtag1 #hashtag2