feat(settings): the codeman agent skill is on by default

agentSkillEnabled now reads an absent key as ON, the way
workspaceHooksEnabled does: only an explicit false turns it off. A new
session therefore finds the codeman skill in its folder without a
setting first, and with it the verbs that hand work to other CLIs and to
the local model on this Mac. Settings shows the switch on for the same
absent key.

The injection itself is unchanged: add-only, marker-owned, never through
a symlink, never for remote sessions or a plain shell. Turning the
setting off still removes nothing already written.

The quick-start test now pins the new default (injected on an absent
key, nothing after an explicit false), and the docs that said "default
off" say when that changed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -782,7 +782,7 @@ Everything in this section also ships as an **agent skill**, [`skills/codeman`](
 | Claude Code plugin | `/plugin marketplace add Ark0N/Codeman` then `/plugin install codeman@codeman` | Global, through Claude Code's plugin manager; `/plugin update codeman` follows releases. Pick this OR a `codeman skill install`, not both: a Claude Code with both lists the skill twice (`codeman` and `codeman:codeman`) |
 | Bundled CLI    | `codeman skill install`                                    | Global (`~/.claude/skills/codeman`), for npm installs that never cloned the repo            |
 | Bundled CLI    | `codeman skill install --case <name> [--mode <mode>]`      | One case only; `--mode codex` (or any other run mode) writes it where that CLI looks for skills |
-| Web UI         | App Settings → Agents & CLIs → All agent CLIs → **Codeman Agent Skill** | Auto-injects into each case on session create, where that session's CLI looks: `.claude/skills/` for Claude Code, `.agents/skills/` for Codex, Gemini CLI, OpenCode, Antigravity, Grok, DeepSeek and OMP; not pi, whose project skills trigger a trust prompt (`agentSkillEnabled`, SYNCED, default off) |
+| Web UI         | App Settings → Agents & CLIs → All agent CLIs → **Codeman Agent Skill** | Auto-injects into each case on session create, where that session's CLI looks: `.claude/skills/` for Claude Code, `.agents/skills/` for Codex, Gemini CLI, OpenCode, Antigravity, Grok, DeepSeek and OMP; not pi, whose project skills trigger a trust prompt (`agentSkillEnabled`, SYNCED, on by default since 1.50.0) |
 
 `codeman skill uninstall [--case <name>]` reverses the CLI installs (with `--case`, every Codeman-managed copy in that case, whichever CLI's directory it sits in), and never touches a `skills/codeman` you wrote yourself.