feat(projects): extend default Kanban preset with Backlog, Bug, and Feature

[jeff-nasseri]

Summary

• Added Backlog column (order 0, agentCanModerate: false) before Todo; existing column orders shifted by +1
• Added Backlog ↔ Todo bidirectional transition
• Added Bug card type with the same 8 fields as Task (github_pr_link, attachments, required_mcp, description, acceptance_criteria, tags, prompts, time_budget)
• Added Feature card type with 3 fields: Description, Acceptance Criteria, Tags
• Extracted shared ProvisionCardTypeAsync helper — adoption semantics (upsert) applied consistently across all three card types

Test plan

• Create a new project with the default_kanban template
• Verify the board shows 5 columns: Backlog, Todo, In Progress, Review, Done
• Verify Backlog has agentCanModerate: false (agents cannot pick up cards from it)
• Verify Bug card type exists with the same fields as Task
• Verify Feature card type exists with Description, Acceptance Criteria, and Tags fields only
• Re-run provisioner on an existing org (adoption path): no duplicate columns/types created, 511 domain tests still pass