Body was ~20.5k chars, past the new 20k token-budget gate. Moves the
five migration-type classifications into
references/migration-types.md and the structured planning field tables
into references/planning-fields.md (cross-referencing
templates/migration-plan.md). SKILL.md keeps triggers, boundaries,
the workflow skeleton with summaries pointing at existing references,
the Loading Guide (now including both new files), and specialist
routing; body is now 11,432 chars.
Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>
Magnus Hedemarkandfactory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>