Add agr-cli and skill-debrief skills

[kasperjunge]

Summary

Adds two new in-repo skills under skills/:

• agr-cli — helps an agent operate the agr CLI on the user's behalf: set up new repos, install/sync/upgrade/remove skills, manage agr.toml / agr.lock, and scaffold in-repo skills under skills/. Thin SKILL.md index pointing at 8 workflow-oriented references (setup, handles, installing-skills, syncing, in-repo-skills, configuration, running-skills, troubleshooting).
• skill-debrief — debrief an existing skill after using it: capture session feedback or a retrospective and fold it back in. Listens, proposes, aligns with the user, applies the edit, commits with skill(<name>): ... style, and runs agr upgrade <name> to re-install. For remote skills, offers to file an issue upstream via gh or fork to in-repo.

Both skills are self-contained: they call agr directly and have no hard dependency on each other or on agr-release. Cross-references are described by capability, not by skill name, so each works installed standalone.

Design notes

• Frontmatter: minimal (name, description only) to match the existing agr-release skill.
• Description triggers: both skills list explicit user phrases that should fire them (the description is the only trigger signal, so it's deliberately pushy). skill-debrief triggers on "debrief X", "retrospective on X", "feedback on X", "improve X", etc.
• References strategy: agr-cli follows the progressive-disclosure pattern — short SKILL.md, one workflow-oriented references/<topic>.md per concern. skill-debrief is a single SKILL.md (focused workflow, no need for split).
• skill-debrief workflow: explicit-only trigger, listens (does not interrogate), proposes specific edits, waits for user approval, commits without pushing, runs agr upgrade (not agr sync — local-path skills need re-copy). For remote skills, prefers upstream gh issue create with confirmed title/body, offers fork-to-in-repo as fallback.

Commits

1. feat: add agr-cli and improve-skill skills — initial implementation.
2. refactor: rename improve-skill to skill-debrief — rename for clearer semantic signal ("debrief" reads more naturally as end-of-session retrospective and matches skill-creator naming style). Squash on merge.

Test plan

• agr add ./skills/agr-cli installs cleanly into configured tools
• agr add ./skills/skill-debrief installs cleanly
• agr-cli triggers correctly on phrases like "install the pdf skill", "set up agr in this repo", "agr.toml is broken"
• skill-debrief triggers on "debrief the X skill", "retrospective on X", "feedback on X", "improve the X skill" — and does NOT over-fire on casual mentions of skills
• In a fresh project, agr-cli can guide an end-to-end setup: agr init, scaffold an in-repo skill, register it, sync
• skill-debrief end-to-end: edit an in-repo skill based on feedback, commit with skill(<name>): ..., agr upgrade <name>, no push
• skill-debrief correctly handles a remote-skill case (offers gh issue create and/or fork-to-in-repo)

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