docs(skill): cross-reference the fleet skill and surface session children

[tarekrached]

What problem does this solve?

The main agent-deck skill never mentions the sibling fleet skill or the session children command. An agent that loads only the main skill (the common case — it's the one the plugin triggers on "agent-deck", "session", "sub-agent") has no idea non-blocking child supervision exists, so it re-invents it every time: ad-hoc polling loops over session show / session output, or blocking --wait calls where a fleet peek was the right tool.

Why this change

Docs-only, 6 added lines in skills/agent-deck/SKILL.md:

1. Add agent-deck session children --json to the Essential Commands table (it's the primary supervision read for any parent session, and the only Essential-Commands-tier command that was missing).
2. Add a "Fanning out several children?" pointer in the Sub-Agent Launch section directing the multi-child case to the fleet skill.
3. List the fleet skill in References alongside session-share (which was already cross-referenced).

The alternative — duplicating fleet content into the main skill — would create two copies to keep in sync; a pointer is enough for the agent to load the right skill.

User impact

Agents driving agent-deck stop rediscovering child supervision from --help. No behavior change; no code touched.

Evidence

On main, the gap is verifiable directly:

$ grep -c "fleet\|session children" skills/agent-deck/SKILL.md
0

while the sibling skill and the command both exist (skills/fleet/SKILL.md; cmd/agent-deck/session_children_follow.go).

Real-usage provenance: mining my own Claude Code transcripts (sessions from 2026-07-22, where a conductor-style session supervised agent-deck children) showed the agent working out session children --json from scratch mid-session rather than knowing it from the loaded skill.

Docs-only diff — no test changes; revert-check not applicable.

AI disclosure

• AI-authored (a model wrote most of it)

Model(s), if AI helped: claude-fable-5

Prompt / session log (optional): —

What actually bothered you

My human asked: "I'm surprised how much is being rediscovered every time agent-deck gets invoked by an agent."

Checklist

• Targeted diff: one problem, no unrelated changes
• Tests added or updated for new behavior — docs-only change, no behavior to test
• Test suite passes sandboxed: HOME=$(mktemp -d) XDG_CONFIG_HOME= XDG_DATA_HOME= XDG_CACHE_HOME= go test ./... — not run: docs-only diff, no Go changes (self-check: go-checks skipped)
• If this touches a hot path (list, status, session output, startup, tmux layer): before/after timing evidence included
• CHANGELOG.md untouched (entries are added at landing)
• AI-assisted? Disclosed above, with validation evidence, and I can answer questions about the code
• "Allow edits from maintainers" is enabled

[coderabbitai]

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[github-actions]

👋 Thanks for the contribution — intake looks complete.

Your PR body carries everything the maintainer's validation pipeline reads first: the problem, the reasoning, the human intent behind it, and an AI-disclosure. It will be applied, built, and tested against main, and you'll get a structured result within about a day. Merges are always human.

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