refactor(create-expert): simplify PDCA structure in managers

[FL4TLiN3]

Summary

Remove verbose Plan/Do/Check/Act phases and replace with concise declarations.

Changes

functional-manager

Before (~80 lines):

## PDCA Phases
### Phase 1: Happy-Path Testing
#### Plan
...
#### Do
...
#### Check & Act
...
### Phase 2: Unhappy-Path Testing
...

After (~18 lines):

## Test Categories
**Happy-path**: Valid inputs, expected queries...
**Unhappy-path**: Empty data, invalid formats...
**Adversarial**: Prompt injection resistance...

## Quality Criteria
Happy-path passes when: Core functionality works
...

usability-manager

Before (~45 lines):

## PDCA Loop
### Plan
...
### Do
...
### Check
...
### Act
...

After (~16 lines):

## Usability Properties
- Demo works zero-config
- Setup efficiency
- Error guidance
...

Test plan

• CI passes

Closes #356

🤖 Generated with Claude Code

---

Note

Simplifies manager instructions to be declarative and concise

• functional-manager: Replaces step-by-step PDCA with clear test categories (happy-path, unhappy-path, adversarial) and explicit pass criteria; instructs delegation to expert-tester; output is pass/fail counts per category.
• usability-manager: Replaces PDCA loop with a focused checklist of usability properties (demo zero-config, setup efficiency, error guidance, doctor diagnostics, fresh user success) and delegation to expert-tester; output lists property pass/fail.
• Adds a changeset entry documenting the simplification.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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