finding(pm): dispatch-gates.mjs derives gates only for its own tree, so objectui-lane dispatches hand-derive their gate list, and this shift's list missed the CI Type Check pre-tsc battery #23240

Handoff-report item from the domain:ui seat 2 sign-off (objectstack-ai/objectui#9771), category mechanizable. Filed with finding only: lanes/ui.md says this seat writes no domain:*, type or grade, so routing to the skills lane is triage's call.

What happened

This seat's dispatches to objectui used a gate list derived by hand. The list left out the checks that objectui's CI Type Check job runs before tsc (check:spec-symbols, check:phantom-deps, check:self-import, …). As a result, objectstack-ai/objectui#12317 went red on check:spec-symbols and needed one patch round. The seat-post notes now say to include that battery, but that is prose, not a mechanism.

Measured

• dispatch-gates.mjs takes its tree from its own location: ROOT comes from import.meta.url.
• Its own header says --repo refuses unless the checkout is that repo.
• Run from an objectstack snapshot with --repo objectstack-ai/objectui and an objectui path, it refused ("cannot verify --repo 'objectstack-ai/objectui'") and reported the path as absent from its tree.
• objectui has no copy of the tool. git ls-tree -r --name-only origin/main | grep -i dispatch-gates returns 0 hits on objectui 866763b.

So no tool derives an objectui gate list today, and every objectui-lane dispatch relies on a hand-written one.

Dedupe

• objectstack search_issues for "dispatch gate list objectui Type Check pre-tsc check:spec-symbols omitted hand-derived dispatch-gates": 0 hits.
• objectstack search_issues for "dispatch-gates cannot derive gate list for objectui checkout sister repo tree ROOT": 72 hits. The nearest is [finding] dispatch-gates.mjs answers exit 0 for a path absent from the tree when no --repo is asserted — another repo's path reads as 「changeset not yet written」; the ambiguity should refuse #18383 (absent-path ambiguity, closed). None covers deriving gates for a sister repo.

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