Rene Nochebuena 0864f031a1 feat(rbac): initial stable release v0.9.0 ...

Foundational identity and permission types for role-based access control — bit-set PermissionMask, immutable Identity value type, and PermissionProvider interface.

What's included:
- `Identity` value type with NewIdentity / WithTenant constructors and SetInContext / FromContext context helpers
- `Permission` (int64 bit position) and `PermissionMask` (int64 bit-set) with O(1) Has and non-mutating Grant
- `PermissionProvider` interface for DB-backed ResolveMask(ctx, uid, resource) resolution

Tested-via: todo-api POC integration
Reviewed-against: docs/adr/

2026-03-18 13:25:43 -06:00

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