Issues: file in-app guide (020); archive completed issues

- Add issue 020: in-app user guide (Settings -> Guide), Open, for later.
- Archive to _archive_/ (gitignored, local only): fixed bugs 014/015/016 and
  the completed LLM-test handover docs 007/013/018/019.
- Tracked issues now: 017 (open), 020 (open), README.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

issues/020-in-app-user-guide.md

@@ -0,0 +1,43 @@
+# 020 — In-app user guide (Settings → Guide)
+
+**Status:** Open
+**Type:** Feature
+
+## Motivation
+
+Accounts get created for other people (via Settings → Users), who then log in
+with **zero context**. The repo `docs/` are invisible to anyone without
+repository access, and the About page only shows the version. A new user has
+no in-product answer to "what is this and how do I use it?"
+
+The fix is a short, task-oriented **in-app user guide** — not a copy of the
+repo docs (those target agent builders and operators and would rot if
+duplicated).
+
+## Proposed approach
+
+- A new **Settings → Guide** page, in the nav under the "You" group near
+  About (see the You/Admin grouping added in v0.2.1).
+- Concise, human-facing content: what a feed is, labels (source + tags),
+  getting an API key (link to Settings → API Keys), sharing links, dark mode.
+- A "Posting from an agent" section that points at (or inlines) the bundled
+  posting skill — which is already served at `GET /api/skill` — so the
+  agent-facing part never drifts from the real skill.
+
+Two implementation options for the body:
+1. Hand-written template content (simplest, fully styled).
+2. Hybrid: a written human intro + the skill rendered/linked for the agent
+   part (keeps agent instructions auto-synced with `SKILL.md`).
+
+Recommend the hybrid.
+
+## Scope / notes
+
+- Keep it a **user** guide; leave API reference, deployment, and `/admin/`
+  in the repo `docs/`. Link out rather than duplicate.
+- No new models needed; a view + template + one nav entry.
+- Candidate release: a future minor (e.g. v0.2.2), not urgent.
+
+## Resolution
+
+_(open)_