Plan J3 / spec §23.3.2 patch 2 / §23.4.
Lays the substrate slice for migrating prompt fragments out of
`apps/daemon/src/prompts/system.ts` and into the bundled atom
SKILL.md bodies registered by §3.I3.
apps/daemon/src/plugins/atom-bodies.ts owns the daemon-side loader:
loadAtomBodies(db, atomIds) → AtomBodyEntry[]
The function looks each atom id up in installed_plugins (bundled
rows win), reads the matching fsPath/SKILL.md, strips
front-matter, and returns the raw body. Atoms with no installed
plugin or unreadable SKILL.md are silently skipped — the caller
drops empty entries from the prompt.
packages/contracts/src/prompts/atom-block.ts ships the pure
renderer:
renderActiveStageBlock({ stageId, bodies, iteration? }) → string
Mirrors spec §23.4's composeSystemPrompt sketch. Empty bodies
return ''; multiple bodies are separated by '---' with no trailing
separator. Lives in contracts so the daemon-side composer and any
future contracts-side composer share one definition (§11.8 PB1
single-import guarantee).
The composeSystemPrompt() rewiring itself is the next PR — this
commit gives that PR zero scaffolding to build: the helpers are
reachable, tested, and the bundled atom plugins from §3.I3 already
have the matching SKILL.md bodies on disk.
Tests: contracts 8 → 12 (+4 cases on atom-block); daemon
1482 → 1486 (+4 cases on plugins-atom-bodies covering the
end-to-end loadAtomBodies → renderActiveStageBlock path).
Co-authored-by: Tom Huang <1043269994@qq.com>
