Seed sidebar default pages lazily on expansion, scope page-tab dedupe
to the target pane, let a sole tab split its own pane with a factory
backfill, close menus when focus enters a sandboxed iframe, and pin the
code preview copy banner while unifying its background with the pane.
Address the ds-review-bot v6 review on PR #3849:
- Publish the `lib/json-stream-*.js` chunk that both entry points import.
Without it the installed tarball failed to load with ERR_MODULE_NOT_FOUND,
because `files` listed only `lib/index.js` and `lib/startup.js`.
- Resolve a Session's preset from its log (`agent-preset/selected`) instead of
only the immutable creation header, so a Session that switched preset while
blank is rejected too. Both the persisted and the live path scan the events.
- Write the `--json` error event for Commander grammar rejections (an unknown
option, a missing option value) as well as the action's own usage errors, and
drop Commander's `error: ` prefix from the event message so one event type
carries one message shape.
- Reject a whitespace-only positional instead of falling back to stdin, so an
accidental blank argument cannot consume a pipe.
- Document the stdin task as verbatim and the widened usage-error contract.
Tests: 68 headless unit tests with per-file 100% coverage on src, 14 profile
e2e tests, plus a packed-tarball import smoke check.
- Reject adopting a Session recorded under an agent preset, and one that
recorded no cwd; align the subagent/forked diagnostic wording.
- Write the bounded JSON `error` event for a --json usage error before exit,
since the runner never mounts to write it.
- Keep the caller's exact --session-id instead of the trimmed value.
- Bound object keys and copy a literal `__proto__` key as data rather than
through the inherited setter.
- Reject a lone `-` mixed with other task words.
- Document the in-turn failure contract and step-commit text/thinking timing.
imccyu