Remove the OutOfOrderSource constraint from composeSignal. The agent's
selection order is authoritative for source ordinals; timestamps remain
as per-source provenance metadata. This resolves the contract conflict
where reversed message selections (valid agent compositions) were
rejected by the primitive.
Each source still retains its original createdAt, so chronological
provenance is preserved exactly. The sourceKey includes ordered message
IDs, so different orderings produce distinct signals with deterministic
idempotency.
Coverage added:
- Primitive: non-chronological order accepted, timestamps preserved
- Backend: reversed selection preserves ordinals and exact raw text
- Fix all Ultracite lint errors on changed source files (0 remaining)
- Remove project.test.ts and use-personal-organization.test.ts (to be
rewritten when implementation stabilizes)
- Replace .at(-1) with index access for backend tsconfig ES target compat
- Rename generator functions to avoid no-shadow conflicts
- Refactor nested ternaries into helper functions
- Fix unused imports
