yoi/.yoi/tickets/00001KTKPC9FG/resolution.md

Implemented, reviewed, merged, and validated.

Summary:

• Deprecated long-lived umbrella/progress-container Tickets in maintained workflow/docs guidance.
• Clarified that Tickets should be concrete work items that can be implemented, reviewed, validated, and closed on their own terms.
• Updated broad-request split guidance to use concrete implementable Tickets, durable split decisions, Objective context, and future non-hierarchical typed relations rather than umbrella containers.
• Explicitly disallowed hierarchy/container substitutes such as parent/child, sub-ticket, umbrella, part-of, and contains.
• Preserved the carve-out for concrete planning/design/investigation Tickets.
• Added existing umbrella retirement guidance and recorded a migration/close recommendation on workspace-panel-orchestrator-queue-automation.

Implementation:

• Coder commit: 1349a75 ticket: deprecate umbrella containers
• Reviewer approved with no blocking findings.
• Merge commit: ee41ed9 merge: deprecate umbrella tickets

Validation after merge:

• cargo fmt --check
• git diff --check
• cargo run -q -p yoi -- ticket doctor
• nix build .#yoi

cargo check --workspace was intentionally omitted because the merged implementation is docs/workflow/Ticket-thread-only and no Rust code/tests changed; Nix build covered package/resource integrity.