feat(ultraplan-local): teach ultraplan-local to consume type:ultrareview

plugins/ultraplan-local/templates/plan-template.md

@@ -1,3 +1,19 @@
+<!--
+Optional YAML frontmatter — include ONLY when the plan was generated from a
+`type: ultrareview` input (Handover 6). Lists the 40-char hex IDs of the
+BLOCKER + MAJOR findings consumed from `review.md`. Use block-style YAML;
+the frontmatter parser does not support flow-style arrays.
+
+Plans generated from a `type: brief` input omit this block entirely. No
+plan_version bump — the field is additive and backwards compatible.
+
+---
+source_findings:
+  - 0123456789abcdef0123456789abcdef01234567
+  - fedcba9876543210fedcba9876543210fedcba98
+---
+-->
+
 # {Task Title}
 
 > **Plan quality: {grade}** ({score}/100) — {APPROVE | APPROVE_WITH_NOTES | REVISE | REPLAN}