Add backlog dependency analysis and command suites

[djm81]

Why

After implementing backlog adapters for ADO and GitHub with directional sync (v0.25.1), we need to extend the backlog capabilities beyond simple sync to enable dependency analysis, delta tracking, and integrated DevOps workflows. Without dependency graph analysis, teams cannot understand logical relationships between backlog items (epic → feature → story → task hierarchies) or detect blockers and circular dependencies. Without dedicated backlog/delta command suites, users must use low-level bridge sync commands instead of intuitive backlog-focused workflows. Adding these capabilities establishes SpecFact CLI as the comprehensive DevOps tool for agile workflows.

What Changes

• Implement provider-agnostic dependency graph model and template-driven mapping (BacklogGraph, BacklogGraphBuilder).
• Add graph analyzers: transitive closure, cycle detection, critical path, impact analysis.
• Add CLI: specfact backlog analyze-deps, backlog sync, backlog diff, backlog promote, backlog verify-readiness, backlog generate-release-notes; specfact delta status, delta impact, delta cost-estimate, delta rollback-analysis.
• Extend project commands: snapshot, regenerate, link-backlog, export-roadmap, health-check, devops-flow.
• E4 (plan): Outputs for teams: dependency contract per edge, ROAM list seed, critical path narrative. Add --export json|md. Acceptance: specfact backlog analyze-deps can export a "dependency review packet" (Markdown).

Acceptance Criteria

• Dependency graph model and analyzers implemented; CLI commands under backlog and delta groups.
• specfact backlog analyze-deps can export a dependency review packet (Markdown).
• Configuration in .specfact/spec.yaml; adapter methods for bulk fetch.

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OpenSpec Change Proposal: add-backlog-dependency-analysis-and-commands

[djm81]

OpenSpec Change Proposal Reference

This backlog item was refined using SpecFact CLI template-driven refinement.

• Change ID: add-backlog-dependency-analysis-and-commands
• Template: enabler_v1
• Confidence: 1.00
• Refined: 2026-01-21T09:14:26Z

Note: Original body preserved. This comment provides OpenSpec reference for cross-sync.