docs(wiki): add a Codeman Skill page with the skill GIFs

The skill only had a section inside "Driving Codeman From An Agent". It now
has its own page, docs/wiki/Codeman-Skill.md, built around three real runs:

- five Claude Code workers powering on in the tile grid (2026-10-15)
- eight worker tabs with lineage lines back to the lead (2026-10-15)
- a DeepSeek Harness worker and a Claude Code worker from one prompt
  (2026-10-10)

plus every install route, prompts that work as written, a run start to
finish, which workers it can drive, what it will and will not do on its
own, the Codex notes and what is in the skill. The page says that the grid
recording put each worker on the grid as it started, since sessions an
agent starts do not join the grid by themselves.

The agent page keeps a short skill section (the heading anchor stays) and
links to the new page; the sidebar, Home, FAQ and Settings Reference link
to it too. The FAQ answer no longer says the skill is enabled per case only.
docs/media-assets.md records the new embeds.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/wiki/FAQ.md

@@ -207,10 +207,13 @@ cover them properly.
 ### Can agents start and supervise other agents?
 
 Yes. Codeman ships an agent skill that lets an agent inside a session drive the HTTP API:
-list sessions, spawn workers, send prompts, and block until a worker's turn finishes. It is
-off by default and enabled per case.
+list sessions, spawn workers in any installed CLI, send prompts, and block until a worker's
+turn finishes. Install it once with `codeman skill install` or the Claude Code plugin, then
+ask in plain English, for example *"use codeman to start 5 claude workers, one per TODO
+item"*. The web UI setting that injects it into every new session's case is off by default.
 
-See [Driving Codeman From An Agent](Driving-Codeman-From-An-Agent).
+See [The Codeman Skill](Codeman-Skill), with recordings of real runs, and
+[Driving Codeman From An Agent](Driving-Codeman-From-An-Agent) for the other routes.
 
 ### Can I run a case in a container?