feat(skills): add just-commands skill with dynamic context injection

[ryoppippi]

Summary

Add a new skill that uses Claude Code's dynamic context injection feature (!command`` syntax) to embed just --list output at runtime, replacing the static command list in CLAUDE.md.

What Changed

• Added .claude/skills/just-commands/SKILL.md with dynamic just --list injection
• Updated CLAUDE.md to reference the skill instead of hardcoding commands

Why

The static command list in CLAUDE.md required manual updates whenever the justfile changed. Using dynamic context injection keeps commands in sync automatically and demonstrates a useful Claude Code feature.

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Summary by cubic

Adds a just-commands skill that injects the output of just --list at runtime, replacing the static command list in CLAUDE.md. This keeps commands in sync and removes manual updates.

• New Features
  • Added .claude/skills/just-commands/SKILL.md with dynamic injection using !just --list.
  • Updated CLAUDE.md to add an Available Skills table referencing the skill and remove the static command list.

^{Written for commit aa80fd4. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 2 files

[Copilot]

Pull request overview

Adds a Claude Code “skill” that dynamically injects the current just --list output at runtime, and removes the now-stale hardcoded command list from CLAUDE.md.

Changes:

• Add .claude/skills/just-commands/SKILL.md using dynamic context injection to embed just --list.
• Update CLAUDE.md to point developers (and Claude) to just --list / the new skill instead of a static list.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
CLAUDE.md	Replaces the hardcoded “Essential Development Commands” block with guidance to use just --list / the new skill.
.claude/skills/just-commands/SKILL.md	Introduces a skill that injects just --list output dynamically.

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[Copilot]

The sentence claims Claude will “automatically reference” the just-commands skill, but earlier in this same file skills are described as “Manually invoked”. Please align the documentation (either clarify that this skill is auto-loaded, or update this line to describe the manual invocation mechanism).

Suggested change

	| Skill | Description |
	| ----------------- | -------------------------------------------- |
	| **just-commands** | Available just commands (dynamically loaded) |
	| Skill | Description |
	| ----------------- | -------------------------------------------------------- |
	| **just-commands** | Manually invoked skill that lists available just commands |

[Copilot]

This PR removes the static command list from CLAUDE.md to avoid drift, but there is still a static “Essential Commands” list in .claude/rules/development-workflow.md that appears out of sync with the current justfile (e.g., it references just lint-fix but the justfile defines format). Consider updating that rule to reference this skill or to use just --list as well, so there is a single source of truth.

[Copilot]

user-invocable: false conflicts with CLAUDE.md referencing this skill as a way to discover commands. If the intent is for developers to manually invoke it, set it to user-invocable; if the intent is automatic loading, update the surrounding docs in CLAUDE.md to reflect that skills are not purely manual in this repo.

Suggested change

	user-invocable: false
	user-invocable: true