fix(linkedin): close dogfood friction (S14)

Close all 9 friction points from the S13 newsletter dogfood (operator
elected to fix F6-F9 rather than defer):

- F1: namespace all subagent_type calls in newsletter.md to
  linkedin-thought-leadership:<name> (4 sites + canonical note)
- F2: document agent invocation form + reload requirement in CLAUDE.md
  + README.md (reload itself is an operator action)
- F3: add edition-config / edition-delingstekst / edition-HANDOVER
  templates under config/ + wire into Steps 0 and 8 + footer
- F4: reconcile draft path to <serie>/NN-utkast.md (series root)
- F5: de-hardcode series root (explicit arg / LTL_SERIES_ROOT / default)
- F6: config-derive carousel editions (remove Seres CAROUSEL set);
  correct samle comment
- F7: build-html.mjs exits non-zero when zero HTML produced
- F8: guard parseDelingstekst (graceful ENOENT) + correct Step 8 wording
- F9: relocate agents/README.md -> docs/agents-capability-matrix.md

Re-tested: 87/87 plugin tests pass; build-html/build-linkedin behavior
re-verified live. Per-item outcomes logged in dogfood-S13-friction.md.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

plugins/linkedin-thought-leadership/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