Add issue schema templates

.github/ISSUE_TEMPLATE/breakdown.md

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+---
+name: Breakdown
+about: Turn a plan into standalone task issues
+labels: ["type:breakdown"]
+---
+
+## Source plan
+
+
+## Deliverable
+N standalone `type:task` issues, prioritized, dependencies wired, linked back here.
+
+## Done when
+- [ ] Issues created and linked here
+- [ ] This issue closed
+
+## Dependencies
+none

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug
+about: A defect
+labels: ["type:bug"]
+---
+
+## Context
+
+
+## Steps to reproduce
+1.
+
+## Expected vs actual
+
+
+## Acceptance criteria
+- [ ] Fix + regression test
+
+## Dependencies
+none

.github/ISSUE_TEMPLATE/plan.md

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+---
+name: Plan
+about: Produce a written plan (no production code)
+labels: ["type:plan"]
+---
+
+## Goal
+
+
+## Deliverable
+A merged plan doc at `<path>.md` covering: options · tradeoffs · recommendation · risks.
+
+## Done when
+- [ ] Plan doc merged
+- [ ] Explicitly produces NO production code
+
+## Dependencies
+none

.github/ISSUE_TEMPLATE/task.md

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+---
+name: Task
+about: Standalone unit of executable work
+labels: ["type:task"]
+---
+
+## Context
+<!-- 2-3 self-contained sentences: what & why. No references to prior context. -->
+
+## Acceptance criteria
+- [ ]
+
+## Pointers
+-
+
+## Constraints
+-
+
+## Out of scope
+-
+
+## Dependencies
+none