The spawn command and polecat manager were incorrectly looking for beads
in <rig>/mayor/rig/.beads instead of <rig>/.beads. This caused:
- `gt spawn --issue ga-xxp` to fail with "no issue found" even when
`bd show ga-xxp` worked from the rig directory
- Polecats couldn't find rig-level issues (with ga- prefix) because
mayor/rig has a different beads database (with gt- prefix)
This fix:
- spawn.go: Use r.Path instead of filepath.Join(r.Path, "mayor", "rig")
- polecat/manager.go: Use r.Path for beads.New() initialization
- session/manager.go: Use r.Path/.beads for BEADS_DIR environment
Closes beads-2nh
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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