Assemble Working Context Plan (4.1)

Current Shape

openspec context assembles the resolved OpenSpec root and referenced stores. It no longer includes inferred code repos or implementation-folder discovery.

Implementation Notes

1. Share the relationship gather between doctor and context: registry snapshot, health-mode reference index, root inspection.
2. Build a working-set brief with root and referenced-store members only.
3. Keep unavailable references in JSON/human output with existing diagnostics.
4. Emit .code-workspace files only when explicitly requested; write only that file and require --force to overwrite.
5. Preserve deletion of old workspace/initiative opening machinery.

Test Coverage

• JSON/human context for store, nearest, and declared-pointer sessions.
• Resolved and unresolved references.
• Empty-reference root wording.
• Code-workspace write/refusal/force/missing-parent behavior.
• Read-only snapshot assertions.