Add tests/golden.rs with insta-backed snapshot assertions for:
- researcher (minimal — 3 obligatory blocks only)
- cost-guardian (minimal + output_extra_fields)
- patent-compliance (minimal + references.extra)
- code-implementer (obligatory + 4 implementer-specific blocks)
Coverage: all four frontmatter fields (name/description/tools/model),
role body, block concatenation order, domain_in / forbidden_domain /
handoffs / output format (including extra fields) / references (both
optional memory_project + project_claudemd and references.extra).
The snapshots in tests/snapshots/*.snap are the signed contract —
any change to assembler.rs output must be reviewed via
`cargo insta review` and committed alongside the code change.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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