docs(create-expert): internalize PS-XXX properties as framework-specific

[FL4TLiN3]

Summary

Renames "Perstack Properties (PS-XXX format)" to "Framework Quality Properties (create-expert internal)" to clarify these are internal to the create-expert framework, not official Perstack public concepts.

Changes

Before:

### Perstack Properties (PS-XXX format)

*Security:*
- PS-SEC-01: Minimal tool access - uses `pick` for only needed tools
- PS-SEC-02: Minimal environment - uses `requiredEnv` for only needed variables

After:

### Framework Quality Properties (create-expert internal)

These properties ensure experts follow Perstack best practices.
See docs/making-experts/best-practices.md for the public guidelines.

*Security:*
- Minimal tool access: Uses `pick` for only needed tools
- Minimal environment: Uses `requiredEnv` for only needed variables

Files Changed

• apps/create-expert/src/lib/create-expert-toml.ts
• apps/create-expert/src/lib/agents-md-template.ts

This avoids confusion with the public "Five Principles" documented in docs/making-experts/best-practices.md.

Closes #379

Test plan

• CI passes
• No behavior changes expected

---

Note

Clarifies that quality checks are framework-internal, not public Perstack concepts.

• Rename Perstack Properties (PS-XXX format) → Framework Quality Properties (create-expert internal) in agents-md-template.ts and create-expert-toml.ts
• Remove PS-XXX codes (e.g., PS-SEC-01) and restate bullets as plain quality criteria (security, design, output)
• Add explanatory text pointing to docs/making-experts/best-practices.md
• No runtime/logic changes; string/template documentation updates only
• Add changeset for patch release

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