Add concise PyAutoBrain agent commands

[Jammy2211]

Summary

A thin, human-friendly command veneer over the existing bin/pyauto-brain
router. The Brain stays implicit — users type short verbs (or plain natural
language) and the Brain routes to the right specialist agent; normal usage never
says "PyAutoBrain".

Users speak in short commands; PyAutoBrain performs the routing.

The router already existed (bin/pyauto-brain + conductors/faculties). This PR is
the missing user-facing surface, and is deliberately honest about which agents
exist today.

Commands

Command	Routes to	Tier
/feature	Feature Agent → start_dev	real conductor
/build	Build Agent → vitals → Heart → PyAutoBuild	real conductor
/health	Health Agent loop → vitals → Heart	real conductor
/bug /refactor /docs /research	start_dev pre-tagged with the work-type	work-type entry*
/route <text>	infers the work-type and dispatches	NL router
/brain <agent>	raw bin/pyauto-brain passthrough	debug door

* No dedicated Bug/Refactor/Docs/Research conductor exists yet, so those verbs
route through the Brain dev-flow with their PyAutoMind work-type fixed — still
through the Brain, nothing bypassed — until each earns promotion. This avoids
shipping four look-alike commands that pretend an agent exists.

Mechanism

• Each verb is a thin skills/<verb>/<verb>.md (no SKILL.md), which
  bin/install.sh already turns into a flat ~/.claude/commands/<verb>.md. No
  installer change needed — skills/ is already a scanned root.
• Shared architecture prose lives in one skills/COMMANDS.md (reference-only; the
  installer's dir-scan skips it), so command bodies stay short.
• Docs added to AGENTS.md and README.md.

Validation

• bin/check_skill_line_counts.sh → all primary files ≤200 lines.
• Discovery simulation → all 9 verbs map to flat commands; COMMANDS.md stays
  reference-only.
• No-bypass grep → every command body routes via pyauto-brain / start_dev.

Follow-ups (not this PR)

• Promote bug / refactor / docs / research to dedicated conductors, each
  when its behaviour earns a front door.
• Reconcile /health with /health_check and /pyauto-status (one health door).

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds a concise, user-facing command surface under skills/ that maps short verbs (and a natural-language router) to the existing bin/pyauto-brain agents and the start_dev dev-flow, keeping “PyAutoBrain” implicit for normal usage.

Changes:

• Introduces 9 flat command markdown files (/feature, /build, /health, /bug, /refactor, /docs, /research, /route, /brain) that route into the existing Brain CLI/dev workflow.
• Adds a shared reference doc skills/COMMANDS.md that the commands point to for consistent, centralized routing/architecture context.
• Updates README.md and AGENTS.md to document the new command surface and its tiering (conductors vs work-type entries vs router/debug).

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
skills/route/route.md	Adds the natural-language routing command that classifies and dispatches to the appropriate verb command.
skills/research/research.md	Adds a research/ work-type entry command routed through the Brain dev-flow.
skills/refactor/refactor.md	Adds a refactor/ work-type entry command routed through the Brain dev-flow.
skills/health/health.md	Adds the /health command as the front door to the Health conductor loop.
skills/feature/feature.md	Adds the /feature command routing to the Feature conductor and then into start_dev.
skills/docs/docs.md	Adds a docs/ work-type entry command routed through the Brain dev-flow.
skills/COMMANDS.md	Centralizes shared command-surface guidance and explains tiers + installation behavior.
skills/build/build.md	Adds the /build command routing to the Build conductor and surfacing the vitals verdict.
skills/bug/bug.md	Adds a bug/ work-type entry command routed through the Brain dev-flow.
skills/brain/brain.md	Adds a debug passthrough command for direct bin/pyauto-brain invocation.
README.md	Documents the new implicit-Brain command surface and where command bodies live.
AGENTS.md	Documents the command surface alongside the existing CLI/agent architecture description.

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