Costumes + Disposition traits: pre-made Bud presets and persona flavor

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Type: HITL — the Costume roster (names, trait recipes, visual identity) needs a product/design review · Source: PRD v1 · Stories: 9, 11

What to build

Persona flavor on top of the mechanical core, in one slice:

• Disposition traits (goals, domain familiarity, mood, voice) and custom instructions resolve into the disposition prompt in the Bud config, shaping the Bud's commentary and reactions — flavor, never the source of truth for Findings.
• Costumes: named, branded Trait bundles (e.g. "Grandma Bud" = vision + low-domain + low-patience) selectable at Run setup in the Dashboard, so a PM gets a relevant Bud without configuring individual traits.

Acceptance criteria

• Disposition traits + custom instructions resolve into the Bud config's disposition prompt (unit-tested in the Bud Model)
• Disposition observably shapes commentary/reaction text in a real Run, while Findings' evidence and confidence stay disposition-independent
• At least 3 pre-made Costumes defined as data (trait bundle + identity), selectable at Run setup in the Dashboard
• Selecting a Costume resolves to the same Bud config as hand-picking its constituent Traits
• Costume roster reviewed and approved (HITL checkpoint)

Blocked by

• Web Interaction adapter: real Bud achieves a goal on a real Target #3
• Bud Model + Calibration: traits resolve, budgets bind #4
• Dashboard walking skeleton: launch and watch a Run live #5