skills: trim all SKILL.md descriptions under Codex 500-byte cap
Codex CLI enforces 500 bytes per skill description and a 2% context-window
budget across all loaded skills. Nine solstone SKILL.md files ran 577-848
bytes each, bloated by duplicate 'Use when owner asks' prose and fully-
qualified 'sol call X Y' command lists that restated TRIGGER keywords.
Trimmed to 267-334 bytes each by:
- dropping 'Use when owner...' prose (TRIGGER already covers intent)
- collapsing 'sol call X a, sol call X b, sol call X c' to 'sol call X a/b/c'
- removing 'Also:' redundant phrase blocks
All TRIGGER keywords preserved — just rephrased once instead of twice.
User-wide install at ~/.claude/skills/solstone/ refreshed via
`npx skills add ./skills/solstone -g -a claude-code -y`.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>