Paradoc v0.3.0

Paradoc 0.3 adds a purpose-built expression language and publishes the deterministic session engine for guided form completion.

Highlights

• @paradoc/expr provides a typed parser, evaluator, and artifact-aware checker with exact decimal and temporal values.
• @paradoc/sessions provides an event-sourced, storage-agnostic form-completion engine.
• Fill state reports one visibility and requirement status, transitive blockers, and the next field in dependency order.
• The SDK exposes expression APIs through expr, including parsing, checking, and Decimal.

Other changes

Core

• Artifact logic runs on @paradoc/expr, and hidden fieldsets now hide their full subtree.
• The expr-eval-fork dependency is removed.