Add a first-party agent guide installer

[Teakowa]

Goal

Provide a small first-party Wright command that installs the canonical agent-facing Wright capability guide into a coding-agent project, so users can enable the Wright workflow without Node tooling or manually reconstructing agent instructions.

Context

Wright owns the executable agent/tooling surface: diagnostics, lint/analyze/inspect, structured query/service contracts, validated edits, provider integration, and future agent transports. The installable guidance should teach a general coding agent how to discover and use those capabilities; it should not contain a second Workshop semantic implementation or a parallel tool suite.

The public wrightkit/skills repository is the distribution home for this optional guidance layer.

Scope

• Add an agent CLI surface with a one-command install path for the canonical Wright agent guide.
• Install the guide project-locally by default; allow an explicit destination or supported-agent target when needed.
• Keep the installed content small and capability-oriented:
  • discover Wright capabilities instead of assuming a fixed command inventory;
  • prefer Wright structured diagnostics/queries/validated edits over textual guessing;
  • use owning language engines through Wright rather than recreating language semantics;
  • re-check/validate after edits;
  • surface unsupported capabilities explicitly instead of silently falling back.
• Keep manual installation possible from wrightkit/skills.
• Make repeated installation/update safe and deterministic.
• Document removal/update behavior.

Non-goals

• A generic agent framework, planner, model integration, or prompt manager.
• Reimplementing Agent Skills package management.
• Bundling Workshop reference corpora or large static knowledge prompts.
• Shipping separate JS/Python helper tools for symbol search, compilation, or analysis.
• Adding language semantics outside their owning repositories.

Acceptance criteria

• A user with Wright installed can add the current canonical Wright agent guide to a project with one Wright command.
• The installed guide contains no executable semantic/tool implementation and does not require npm.
• The guide directs agents to runtime capability discovery and Wright-owned structured interfaces rather than hardcoding a second semantic contract.
• Re-running the command does not create duplicate conflicting copies.
• Manual installation of the same guidance from wrightkit/skills remains documented and possible.
• Existing Wright behavior is unchanged when the agent guide is not installed.

Dependencies / ownership

• Owner: Wright for CLI installation and executable agent capability surfaces.
• Related: Ship a versioned agent contract over the shared tool service #407 (versioned agent contract), Establish a product-level coding-agent benchmark for Workshop workflows #414 (coding-agent benchmark), wrightkit/skills repository simplification/rename work.
• wrightkit/skills owns only the distributable guidance artifact and its manual-install documentation.