feat: bash tool execution in background

[uinstinct]

Description

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• [] The relevant tests, if any, have been updated or created

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Tests

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Summary by cubic

Run Bash tool commands in the background from the CLI. Press Ctrl+B to background a running command, then monitor it with /jobs or the CheckBackgroundJob tool; background jobs are cleaned up on exit.

• New Features
  • Background job system with IDs, output capture, and status tracking (max 5 concurrent; auto-kill on exit).
  • Ctrl+B moves the current Bash execution to the background and returns the Job ID.
  • /jobs slash command lists all background jobs with status and duration.
  • CheckBackgroundJob tool returns a job’s status, exit code, and full output.
  • TUI shows “ctrl+b to background” while the Bash tool is running.

^{Written for commit 149a27c. Summary will update on new commits.}