Why: prompts lived inline in Go (profile const, subagent string, squad
role one-liners, tool descriptions) - every copy change shipped code,
and task guidance like meeting-minutes quality lived permanently in the
base prompt whether or not the task was at hand.
Evidence: new prompts package tests (library integrity, default
assembly, skill triggering incl. attachment gate and command bypass,
priority supersession, override chain drift, command match, frontmatter
parse); composite make test green; runtime check on a live server
(40 modules across 7 layers, override round-trip, /minutes starts a
run instead of hitting the command bus).
Impact: 40 builtin modules as embed data (5 base + 1 env + 12 task
skills + 10 agent roles + 7 tool descriptions + 3 aux templates + 2
styles); migration v8 adds prompt_modules for user overrides with
basedOnVersion drift markers; ctxasm assembles multi-segment system
messages with per-module observability; subagent/squad/tool copy now
resolve from the library with inline fallbacks; skill commands surface
in the / menu and route to runs; default profile SystemPrompt empties
onto the library base; pins deps/agent-system-core to the contract
commit.
Refs: feature/prompt-library task card; design guide in Documents.
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