The CommandOptions interface in packages/cli/src/output/with-output.ts had
an open `[key: string]: unknown` indexer, so every consumer of the global
--host and --json options had to cast `options.host as string | undefined`
at the call site. Add `host?: string` and `json?: boolean` to the interface
and remove 29 redundant casts across 12 command files.
Add oxlint-tsgolint and configure typescript/no-unnecessary-type-assertion
to flag redundant `!` and `as Foo` casts. Type-aware mode is left off by
default to keep `npm run lint` fast; the rule sits configured for when we
turn type-aware on intentionally. Auto-fix removed ~283 redundant casts;
two manual touch-ups: a real tsgolint false positive in split-container.tsx
and a stale ChildProcess import after a double-cast collapsed.
