fix(twitter): restore intercepted readers

[kannch8765]

Summary

Restore the reader-side subset of upstream AutoCLI PR nashsu#65 on top of the current fork main.

This ports the already-tested fixes from the old fix/twitter-upstream-sync branch without bringing the unrelated reply changes:

• make CollectStep read and clear AutoCLI's actual interceptor buffer, window.__autocli_intercepted
• add regression coverage so the buffer name cannot silently drift back to __opencli_intercepted
• accept current X timeline_v2 payloads in followers/following while retaining the legacy fallback
• use AutoCLI's supported scroll.count / scroll.delay fields in notifications
• target the full /followers timeline instead of /verified_followers

Provenance

Reader fix originally landed as 2758e4c on the old PR nashsu#65 branch, followed by the followers timeline fix 4208b67. Those commits never entered this fork's main, which is why twitter notifications regressed to [] after returning to main-based builds.

This PR reapplies only those reader changes onto current main @ 59f357d.

Validation

• all three modified Twitter YAML files parse successfully
• all 8 embedded JavaScript snippets pass node --check
• diff is limited to:
  • adapters/twitter/followers.yaml
  • adapters/twitter/following.yaml
  • adapters/twitter/notifications.yaml
  • crates/autocli-pipeline/src/steps/browser.rs

The current VPS maintenance lane no longer has a Rust toolchain installed, so Rust compilation/tests are left to repository CI rather than installing a new toolchain ad hoc.