Adds `.claude/rules/asset-pipeline.md` describing the full pipeline —
generators, meta stamp, pre-push hook, how to make DB/schema changes,
and why direct systems.db edits are forbidden. CLAUDE.md and DEVOPS.md
point at the rules file; sprint-start template now reminds teammates
to read it before touching DB sources.
CLAUDE.md also gains the missing `decision show` row in the CLI tool
table (companion to #723's `decision show` subcommand).
Refs: #859#723
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>