[WIP] Fix templates missing Non-Goals and Quality Checklist sections

[Copilot]

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Multiple templates missing Non-Goals and Quality Checklist sections</issue_title>
<issue_description>## Summary

11 templates are missing one or both of the Non-Goals and Quality Checklist sections that CONTRIBUTING.md and bootstrap.md require.

Missing Quality Checklist

CONTRIBUTING.md quality checklist states: "Templates have a quality checklist section." The following 5 templates lack this section:

Template	Has Quality Checklist?
investigate-bug	No
investigate-security	No
review-code	No
plan-implementation	No
plan-refactoring	No

All other templates (13/18) have quality checklists.

Missing Non-Goals

bootstrap.md guidelines state: "Include non-goals in every assembled prompt." The following 6 templates lack a Non-Goals section:

Template	Has Non-Goals?
author-requirements-doc	No
author-design-doc	No
author-validation-plan	No
plan-implementation	No
plan-refactoring	No
author-release	No

All other templates (12/18) have Non-Goals sections.

Overlap

plan-implementation and plan-refactoring are missing both sections.

Suggested approach

Add template-appropriate Non-Goals and Quality Checklist sections to each affected template. These should be specific to each task, not generic boilerplate.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Multiple templates missing Non-Goals and Quality Checklist sections #20

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