Decompose

Tickets are the unit of generation: one ticket, one focused session, one reviewable PR. Bad decomposition produces horizontal layers ("all the models", "all the UI") that ship nothing until everything lands. Good decomposition produces vertical slices that each prove something end to end.

Slicing rules

1. First ticket is a walking skeleton — the thinnest end-to-end path through every layer the feature touches (one field, one status, one happy-path flow, deployed). It flushes out integration surprises while the stakes are lowest.
2. Every later ticket thickens the skeleton: an edge case, a failure path, a UI state. Each independently shippable and revertable.
3. A ticket fits one session: roughly ≤400 lines of non-generated diff. If you can't state its proof-of-done in one sentence, split it.
4. Dependencies are explicit edges ("blocked by #2"), and kept rare — a deep dependency chain is horizontal slicing in disguise.

Ticket format

## <verb phrase>
Outcome: <one sentence a reviewer can verify>
Touches: <likely files/modules>
Proof of done: <the test, screenshot, or driven flow that closes it>
Blocked by: <ticket refs or none>
Claims: <shared resources — see below>

The shared-resource collision check — mandatory

Before finalizing, list every claim the work makes on resources where two branches can silently conflict and merge cleanly anyway:

• migration slots / sequence numbers
• enum values and status names
• queue, job, and cron names
• env var names, config keys, secret names
• ports, route paths, deep-link schemes

Check each claim against (a) other open branches — git branch -a plus the open PR list — and (b) the shared-resource registry in CONTEXT.md. Record new claims in the registry now, not at merge time. Two branches claiming migration 0009 merge without conflict and break the migration chain on promotion day; this check costs one minute and prevents exactly that.

Exit

Tickets filed on the project tracker (or docs/tickets/ if none), registry updated, and the walking skeleton marked as the starting point.