v0.6.0 — Current and concurrent thread work

Threads now keep their Linear work current as they move between tasks or work on several issues together.

• Track active issues, one current issue, and previous-work history. Switching tasks preserves history; finishing work in BB does not change Linear status.
• Add linear_thread_work and bb linear work operations for starting, adding, focusing, finishing, removing, and clearing thread work.
• Scan newly accepted user messages instead of only the first 20 prompts. Incidental references remain suggestions with separate Switch and Add actions.
• Show the current issue and additional active count in the header, with active-work controls and history in the issue panel.
• Preserve existing binding responses for older clients and extend single/batch RPC responses with active work. Migrate existing links and retain provenance.
• Guard task changes with revisions so stale UI requests and delayed detection cannot overwrite newer work. Keep removals inactive across restarts.

Validation: TypeScript, 984 automated tests across 54 files, and the plugin build passed. Tests include server/RPC/CLI/tool transitions and rendered React interactions. Live CLI was exercised; browser visual inspection was unavailable.

The companion activity-sidebar consumer needs its corresponding update to display additional active counts; older consumers continue to show the current issue.

v0.5.0

Publish the existing immutable release tag as a GitHub release. The performance audit required no additional source changes in this repository.

Validation: TypeScript check passed. The automated test suite passed. Runtime coverage and load measurements are limited to the exercised paths; this release does not assert that every workload was benchmarked.