$ca-decompose — greenfield populate

Compatibility route. Prefer $ca-init --greenfield for new usage. This installed route remains functional under the command-route compatibility policy at includes/command-compatibility.md; continue with the unchanged greenfield workflow below.

Stands up project state for a greenfield project — one with no meaningful source code yet. A senior-architect persona drives a six-layer interview eliciting purpose, scope, primary users, domain vocabulary, and architectural constraints, persisting each layer to disk so a context reset loses nothing, then writes the surviving .codearbiter/ doc set and locks the project initialized. No arguments — the skill interviews the user (a handoff summary may be supplied freely during the interview).

The only permitted path to populate .codearbiter/ when no meaningful source exists. For an existing codebase, use $ca-create-context.

Routes to

The decompose skill (routines/decompose/SKILL.md) — six gated phases: pre-flight, persona adoption, layered interview, synthesis, population, lock. The skill is canonical for the layers and their gates.

When NOT to use

• Project already initialized (<!--INITIALIZED--> in CONTEXT.md) → $ca-status.
• Existing codebase with source present → $ca-create-context.
• .codearbiter/ not yet scaffolded → $ca-init first.
• Update one doc → edit <project-root>/.codearbiter/ directly or use $ca-feature.

Hard gate

BLOCK if <!--INITIALIZED--> is already present in CONTEXT.md. BLOCK if meaningful source is detected (route to $ca-create-context). BLOCK if any [CONFIRM-NN] exits synthesis unresolved and undeferred. MUST NOT write <!--INITIALIZED--> until every required doc is present and non-empty.