Task: Add compass codegen entity lint — flag missing variability knobs on a model

Add a compass subcommand that lints an entity .org model file: classify its stereotype, then check for the knobs that stereotype is expected to declare, warning on gaps instead of letting them surface later as a runtime bug (e.g. an empty change-reason dropdown, a silently absent Qt/SQL layer).

• compass has a lint command taking a model .org path (or component/entity), reusing the existing org-loader parsing; it reports one warning per missing/inconsistent knob, referencing the same knowledge base as the sibling scaffold task so the two never drift apart; run against all DQ models commissioned so far as a first real use.

(Implementation strategy. Written when work starts; key decisions are distilled into the parent story's * Decisions at close, but the plan itself stays — it is the historical record of what we did.)

Scoped narrower than the Entity evaluation skill and runbook story (Sprint 19; discarded 2026-09-03 as superseded by the method-skill task in the drift-rollout story) and the entity commissioning process reference's per-layer criteria: those cover a full post-generation, live-system health check across twelve layers (DB/Qt/shell/CLI/HTTP/Wt/manual), including manual QA steps like "open the app, edit a field, save". This task is a static lint of the model .org file itself, run before generation, catching declared- vs-expected knob gaps the moment the model is authored rather than after a save silently fails in the UI.

Depends on the knowledge base built in the sibling task Scaffold model .org files per entity type (updated org_entity_meta_model.org, per-stereotype expected-knob list) – both tasks should read from the same source so they can't drift apart. Implementation should reuse the existing org-loader parsing in ores.codegen rather than re-parsing .org files independently.

There's a related, unstarted sibling-story task, B6: Add compass codegen entity archetypes subcommand, for a different but adjacent `compass codegen entity` subcommand (lists the physical-space archetype catalogue). Check for shared CLI plumbing before landing this one's command surface.

Manual QA scenarios (scaffolded via compass add test_scenario, run through the QA Validation Runner panel) that verify this task. Link new ones here as they're created; the scenario doc itself links back via its "Verifies task" field.