fix: Complete hybrid workflow documentation gaps

[striderZA]

Description

The automated PR review (#28) identified two gaps in the hybrid workflow documentation that need completing:

Gap 1: Missing producer role in slimmed hierarchy

The 10-role hierarchy in docs/hybrid-workflow.md drops the producer agent, but AGENTS.md Rule 4 states:

"When a design change affects multiple domains, the producer agent coordinates the propagation."

Required change: Document which role handles cross-domain coordination in the slimmed hierarchy (e.g., assign to technical-director or creative-director).

Gap 2: No guard against review-mode state bleed

The full OCGS /prototype skill reads production/review-mode.txt to determine gate strictness. The hybrid /hybrid-prototype skill correctly bypasses this, but there's nothing preventing a session from accidentally inheriting stale review-mode state after switching workflows.

Required change: Add a note in the /hybrid-prototype skill that it explicitly bypasses production/review-mode.txt and resets any inherited review state.

Files to Modify

• docs/hybrid-workflow.md — assign producer duties to a role in the hierarchy table
• .opencode/skills/hybrid-prototype/SKILL.md — add review-mode guard note

References

• PR feat: Hybrid Discovery-Production Workflow #28
• Review comment: feat: Hybrid Discovery-Production Workflow #28 (comment)