v0.1.0-alpha.53

• Process starts now use a typed, closed execution environment carrying plugin options and policy instead of loose product metadata.
• Durable Lashlang processes validate rebuilt snapshot-backed tool authority before registration and again during worker recovery.
• Process provenance no longer carries a host profile id; portability is enforced by captured environment refs, installed plugins, artifact refs, and Host Requirements validation.

Full Changelog: v0.1.0-alpha.52...v0.1.0-alpha.53