Adds ability to override embedded role templates at town or rig level:
- Town: <townRoot>/templates/roles/<role>.md.tmpl
- Rig: <rigPath>/templates/roles/<role>.md.tmpl
Rig-level overrides take precedence over town-level.
This enables customizing polecat (or other role) behavior per-rig without
modifying gastown source, following the same 3-tier override pattern as
role configs.
New APIs:
- NewWithOverrides(townRoot, rigPath string) - loads templates with overrides
- HasRoleOverride(role string) bool - check if role has override
- RoleOverrideCount() int - count of loaded overrides
Implements sc-6ghhn
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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