Create comprehensive harness documentation covering:
- What a harness is (installation directory vs town concept)
- Harness structure and creation with gt install
- Beads redirect patterns for complex setups
- Multi-system sharing (PGT/GGT coexistence)
- Configuration files (town.json, rigs.json, state.json)
- Harness templates for organizations
- Migration between harnesses
Update architecture.md to:
- Rename "Town" section to "Harness (Town)" with clearer explanation
- Add cross-references to new harness.md
- Update directory structure section with "Harness Level" heading
- Expand CLI commands section with more gt install options
Update install.go help text to reference harness.md.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
