feat: add /add-wiki skill for persistent LLM Wiki knowledge bases

Container skill teaches the agent to maintain a structured, interlinked
wiki from ingested sources. Feature skill bootstraps the setup — directory
structure, group CLAUDE.md, optional scheduled lint.

Based on Karpathy's LLM Wiki pattern.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.claude/skills/add-wiki/SKILL.md

@@ -0,0 +1,114 @@
+---
+name: add-wiki
+description: Add a persistent wiki knowledge base to a NanoClaw group. The agent ingests sources (URLs, files, attachments), builds interlinked wiki pages, answers questions from accumulated knowledge, and runs periodic health checks. Based on the LLM Wiki pattern. Triggers on "add wiki", "wiki", "knowledge base", "llm wiki".
+---
+
+# Add Wiki
+
+Adds a persistent wiki knowledge base to a NanoClaw group. The agent builds and maintains structured, interlinked markdown pages from sources you provide. Knowledge compounds over time rather than being re-derived on every question.
+
+Based on the [LLM Wiki pattern](https://gist.github.com/karpathy/442a6bf555914893e9891c11519de94f).
+
+## Phase 1: Pre-flight
+
+Check if `container/skills/wiki/SKILL.md` exists. If it does, skip to Phase 3.
+
+## Phase 2: Apply Code Changes
+
+```bash
+git fetch origin skill/wiki
+git merge origin/skill/wiki
+```
+
+If merge conflicts, resolve them. Then:
+
+```bash
+npm run build
+./container/build.sh
+```
+
+## Phase 3: Setup
+
+### Choose target group
+
+AskUserQuestion: "Which group should have the wiki?"
+
+1. **Main group** — add wiki to your existing main chat
+2. **Dedicated wiki group** — create a new group just for the wiki (recommended for focused research)
+3. **Other** — pick an existing group
+
+If dedicated: ask which channel and chat to use, then register with `npx tsx setup/index.ts --step register`.
+
+### Wiki topic
+
+Ask the user: "What's this wiki for?" (e.g. AI research, health tracking, competitive analysis, trip planning, book companion, general knowledge base)
+
+This shapes the initial index categories and the CLAUDE.md additions.
+
+### Create directory structure
+
+In the target group folder:
+
+```bash
+mkdir -p groups/<folder>/wiki groups/<folder>/sources
+```
+
+Create initial `wiki/index.md`:
+
+```markdown
+# Index
+
+_Last updated: <today>_
+
+(Pages will appear here as sources are added.)
+```
+
+Create initial `wiki/log.md`:
+
+```markdown
+# Log
+
+## [<today>] setup | Wiki initialized
+Wiki created. Topic: <topic>.
+```
+
+### Update group CLAUDE.md
+
+Add a wiki section to the group's CLAUDE.md. Keep it brief — the container skill has the full workflow:
+
+```markdown
+## Wiki
+
+You maintain a persistent wiki on <topic>. When sources arrive (URLs, files, attachments), ingest them into the wiki — don't just answer and move on. The `/wiki` container skill has the full ingest/query/lint workflow.
+
+- Wiki pages: `wiki/` (start with `wiki/index.md`)
+- Raw sources: `sources/` (immutable — never modify)
+```
+
+### Optional: Schedule lint
+
+AskUserQuestion: "Want periodic wiki health checks?"
+
+1. **Weekly** — every Sunday at 10am
+2. **Monthly** — first of each month
+3. **Skip** — lint manually when needed
+
+If yes, use `mcp__nanoclaw__schedule_task`:
+- prompt: "Run a wiki lint. Check for contradictions, orphan pages, stale content, missing cross-references, and gaps. Report findings."
+- schedule_type: "cron"
+- schedule_value: `"0 10 * * 0"` (weekly) or `"0 10 1 * *"` (monthly)
+
+### Optional: Obsidian
+
+If the user uses Obsidian, mention they can point a vault at `groups/<folder>/` for graph view, backlinks, and visual browsing. The wiki is just markdown files on disk.
+
+## Phase 4: Verify
+
+Restart the service to pick up the new container skill:
+
+```bash
+launchctl kickstart -k gui/$(id -u)/com.nanoclaw  # macOS
+# Linux: systemctl --user restart nanoclaw
+```
+
+Tell the user to test: send a URL to the wiki group. The agent should ingest it, create wiki pages, and update the index.