Pure constructors for workflow audit trail entries.

No I/O — entries are plain data maps. Persistence lives in the shell layer.

Pure workflow state-machine introspection.

Helpers for reading the shape of a WorkflowDefinition map (states, initial
state, transitions). No mutable state and no I/O.

The definition registry and the `defworkflow` macro live in the shell
(boundary.workflow.shell.registry) — this namespace holds no mutable state.

Pure business logic for workflow transition decisions.

All functions are pure — no I/O, no side effects.
Guards and side-effect dispatch rely on data maps, not concrete impls.

Pure Hiccup UI components for workflow admin visualization.

All functions are pure — they receive data and return Hiccup structures.
No side effects, no I/O, no logging.

Components:
  state-badge          — colored state pill
  state-machine-vis    — read-only workflow state diagram
  audit-log-table      — chronological audit trail table
  instances-filter-form — search/filter form for instance list
  instances-table      — paginated instance list table
  instances-page       — full page: instance list
  instance-detail-page — full page: instance detail with state viz + audit trail