CI: Add integration test job that runs go test -tags=integration for
install, rig, and beads routing tests.
Crew lifecycle: Pass startup beacon as Claude's initial prompt instead
of nudging after startup. Removes timing-dependent sleep/nudge sequence.
Also removes redundant SetEnvironment calls (env vars already exported
in BuildCrewStartupCommand).
🤖 Generated with Claude Code
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>