docs: publish docs/wiki as the user manual, with a sync workflow

30 pages covering install, concepts, the dashboard, the agent CLIs, unattended
runs, remote and Docker cases, security and the HTTP API, plus a sidebar and a
footer. The wiki repo has no CI and no review, so docs/wiki is the source of
truth and .github/workflows/wiki-sync.yml mirrors it on every push to master.

The workflow refuses to mirror when docs/wiki is missing or holds no pages,
because it deletes before it copies and would otherwise publish the deletion of
every page. The footer carries a {{VERSION}} placeholder stamped at publish
time rather than a hand-written version, which went stale on every release.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/wiki/_Footer.md

@@ -0,0 +1,9 @@
+Documents Codeman **{{VERSION}}**. Something wrong or missing on this page? These pages are
+generated from [`docs/wiki/`](https://github.com/Ark0N/Codeman/tree/master/docs/wiki) in
+the main repository, so browser edits here are overwritten on the next sync. Send a pull
+request against that directory instead, or open a
+[Discussion](https://github.com/Ark0N/Codeman/discussions).
+
+<!-- {{VERSION}} is replaced with the current major.minor series by
+     .github/workflows/wiki-sync.yml at publish time. Do not hardcode a
+     version here: it went stale every release when it was hand-written. -->