What problem does it solve? D2R methodology versions evolve while real projects accumulate authored PRD/TRD/AVD/TQVCD/UXD/PSCAD bundles pinned to older versions, causing compatibility errors when downstream tools expect the current schema. This Skill walks an existing bundle through the required migration path without discarding authored content. ## Core Features & Use Cases - Version Detection and Path Planning: Reads each doc's methodology_version frontmatter, infers version from structure when absent, and generates a per-doc migration plan for user approval before any changes. - Version-Specific Section Migration: Applies additions such as UXD authoring for v0.1→v0.2, heading-prefix IDs and Amendment Protocol for v0.2→v0.3, TQCD→TQVCD rename cascade, and PSCAD addition for v0.3→v0.4, preserving authored content verbatim. - Cross-Doc Audit and Reporting: Runs the ASAE alignment audit after migration and produces an upgrade report with per-doc deltas, assigned IDs, and open questions. - Use Case: A project authored against methodology v0.2.x fails a CDCC compatibility check; run this Skill on the planning directory to migrate all five docs to v0.3.0 with a reviewable plan and final report. ## Quick Start Upgrade the D2R bundle in my planning directory from methodology v0.2.x to the current version and show me the migration plan first.