Tasks: 003-agentic-harness-foundation

• T00301 Define harness functional and non-functional deltas.
• T00302 Implement state generation hook and runtime script set.
• T00303 Add generated harness artifact writer in runtime harness installer.
• T00304 Ensure contribution guidance points upstream to spec/state-pack workflow.
• T00305 Renumber downstream state lineage and update catalog/docs links.
• T00306 Regenerate docs/state pages and validate catalog-derived outputs.
• T00307 Republish generated state branches with updated numbering and lineage.