ci: clear the snapshots-and-artifacts lane — lint sweep and TUI snapshot re-record

Lint: eslint --fix over the merge-crossed projection/command files (arrow
parens, trailing commas, unnecessary assertions), Extract<> replaces the
keyof-map & string intersections no-redundant-type-constituents rejects,
the fold-adapter's merge loop drops its non-null assertions for a
bounds-carrying cursor, one JSDoc line wrapped under max-len (api-catalog
regenerated). Snapshots: the four TUI goldens re-recorded for the merged
event-count shift (the durable command lifecycle adds one event to the
seeded diagnostics log). The headless advanced-toolchain snapshot passes
on CI and fails locally in this sandbox both with and without these
changes (30s child timeout — environment-bound, tracked in the ledger).

packages/client/ui-conversation/tests/skeleton.spec.tsx

@@ -93,7 +93,7 @@ function mount(
           useSession={useSession}
           useSessions={props.useSessions}
           useWorkspaces={props.useWorkspaces}
-          useProjection={(() => undefined) as never}
+          useProjection={(() => undefined)}
           useInput={useInput}
           inputActions={inputActions}
           useStore={bindSnapshotSelector(chat)}
@@ -116,7 +116,7 @@ function mount(
           useSession={useSession}
           useSessions={props.useSessions}
           useWorkspaces={props.useWorkspaces}
-          useProjection={(() => undefined) as never}
+          useProjection={(() => undefined)}
           useInput={useInput}
           inputActions={inputActions}
           keyboard={wiring}
@@ -135,7 +135,7 @@ function mount(
     useSession,
     useSessions: bindSnapshotSelector(sessions),
     useWorkspaces: bindSnapshotSelector(workspaces),
-    useProjection: (() => undefined) as never,
+    useProjection: (() => undefined),
     useInput,
     inputActions,
     renderSlot,