* fix(pairing): keep terminal QR codes scannable
Prompt framing could wrap dense QR codes and alter long pairing links. Print pairing instructions directly, add the standard quiet zone, and suppress codes that cannot fit without auto-wrapping.
* fix(pairing): contain terminal QR background
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.
