spfx-estate-doctor: Inventory an SPFx Estate Without Touching a Tenant

The spfx-estate-doctor tool provides an offline, read-only scanner to inventory SPFx estates without tenant access, identifying versioning issues, missing owners, and duplicate IDs. Meanwhile, the latest spfx-factory release introduces an evidence-gated agent to verify project readiness. This workflow utilizes an evidence ledger covering SCAFFOLD, CODEX, POLICY, LOCAL, and ASSURANCE checks. Each check is categorized as verified, warning, blocked, or not-tested, ensuring a structured validation process while maintaining backward compatibility with existing factory reports.