feat(setup): implement robust artifact inference and state priority table

[moisgobg]

This PR replaces the imperative setup_state.json management with a declarative "Artifact Audit" in the setup command.

Key Changes:

• State Inference: Replaced procedural state-checking with a declarative Priority Table that maps physical artifacts (product.md, workflow.md, etc.) to specific setup sections.
• Project Maturity: Refined Greenfield/Brownfield detection to be "Conductor-aware." It now correctly ignores the conductor/ directory and empty/newly initialized .git repos when determining if a project exists.
• Fast-Forward Logic: Introduced a context-establishment step that determines project maturity before jumping directly to the target resume section, ensuring the agent doesn't ask redundant questions.
• Self-Healing: Added a pre-requisite cleanup step to Section 3.0 to handle interrupted track generations by wiping incomplete folders and restarting cleanly.
• Token Efficiency: Significantly reduced prompt logic size and eliminated redundant file-write tool calls.

Related Issue: fixes #136