feat: add draft_task entity for multi-turn clarification workflows

[MaxLinCode]

Summary

• Introduces a draft_task entity kind so new-task clarification workflows accumulate fields across turns instead of resetting
• When operationKind === "plan" and targetRef === null, a draft_task is created in the entity registry; clarification entities point their parentTargetRef at it, and pending_write_operation.targetRef is patched to reference it
• After mutation creates a real task, the draft is superseded
• Improves deriveAmbiguityReason to surface missing-fields info instead of generic confidence messages

Test Plan

• Schema tests: draft_task parses correctly, rejects invalid data
• Entity context: active drafts appear in knownEntities, superseded ones excluded
• Turn router: getParentEntityId returns undefined for drafts; ambiguity reason mentions missing fields
• Conversation state: draft creation, update, parentTargetRef wiring, targetRef patching, negative cases (edit ops, non-null targetRef)
• Mutation state: active drafts superseded after task creation
• Integration: full 2-turn clarification workflow validates field accumulation end-to-end
• All 299 tests pass across 29 test files
• Typecheck clean (pre-existing error in interpret-write-turn.test.ts unrelated)

🤖 Generated with Claude Code

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
atlas-web	Ignored		Apr 16, 2026 11:33pm