PR-10d Bank Composition Family Policies and Section Coordinator

Domain owner: docs/studio Cross-domain impact: docs/packer

Briefing

Introduce the section-scoped coordinator for Bank Composition, built around StudioFormSession<BankCompositionDraft>, plus the first family-specific draft factories and policies.

This is the slice where the section starts behaving like an actual editor instead of just a shell.

Objective

After this PR:

Bank Composition has a section-scoped coordinator built around StudioFormSession<BankCompositionDraft>;
the section can enter edit mode and maintain draft state;
draft state can transfer rows between available and selected;
right-list ordering can update draft state;
family-specific rules are applied through draft factories and policies, not component-local logic.

Dependencies

Scope

add BankCompositionDraft
add the section-scoped coordinator around StudioFormSession<BankCompositionDraft>
add family-specific draft factories
add family-specific policies for:
- transfer eligibility
- reorder effects
- capacity usage
- hard-limit blockers
publish one section-facing view model for shell, lists, meter, blockers, and hints

Non-Goals

no public workspaceBus contract yet
no packer apply persistence yet
no final cross-domain mutation messages yet

Execution Method

Add the draft model for bank composition.
Add the section-scoped coordinator around StudioFormSession.
Add the first family-specific policy/factory implementations.
Route dual-list and meter inputs through the coordinator view model.
Support edit, reset, and cancel with real draft recomputation.
Keep apply stubbed or disabled until the write path lands.

Acceptance Criteria

the section can enter editing mode and maintain draft state
dual-list moves update draft state through the coordinator
right-list ordering updates draft state through the coordinator
meter state reflects policy-driven capacity calculations
tile and sound family differences are modeled through policies, not through component branches
reset and cancel work through StudioFormSession

Validation

unit tests for BankCompositionDraft
unit tests for tile and sound policy behavior
unit tests for transfer blocking and reorder effects
unit tests for StudioFormSession integration and draft lifecycle

Affected Artifacts

prometeu-studio/src/main/java/p/studio/workspaces/assets/details/...
family-specific policy and draft-factory classes under prometeu-studio/src/main/java/p/studio/workspaces/assets/...
tests for coordinator and policy behavior
cross-domain touchpoint: any details data gaps exposed by the new policy logic

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