v3.6.0

• Lifted the live graph-apply --apply-linear gate so project graphs can be
  created directly through Linear's GraphQL API without requiring a Linear MCP
  server for project creation.
• Added idempotent direct GraphQL operations for projects, labels, milestones,
  issues, issue relations, and attachments, with fake transport handlers,
  rate-limit retries, mutation success checks, and read-back verification.
• Added live graph read-back and project-scan reconciliation so the CLI can
  detect Linear issues missing from the ledger and ledger rows missing from
  Linear.
• Added linear-agent discover and linear-agent promote for Continuous Issue
  Discovery rows and optional live Linear issue creation.
• Updated live Linear smoke coverage, docs, evaluator expectations, and the ADR
  trail for direct API mode. Linear MCP remains a fallback for runtimes without
  credentials, not the graph-creation source of truth.