[WIP] Add missing format fields to templates in frontmatter

[Copilot]

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Template frontmatter missing format field; implementation-plan format does not exist</issue_title>
<issue_description>## Summary

Three templates are missing the format field in their YAML frontmatter, and two of them reference an artifact type (implementation-plan) that has no corresponding format file in the library.

Details

review-code — format field missing from frontmatter

manifest.yaml correctly specifies format: investigation-report for review-code, but the template file (templates/review-code.md) does not include format: in its YAML frontmatter. The bootstrap engine may not be able to resolve the output format when assembling from the template.

Fix: Add format: investigation-report to the template frontmatter (between protocols: and params:).

plan-implementation and plan-refactoring — no format anywhere

Neither template has a format: field in frontmatter or manifest. Both declare output_contract.type: implementation-plan, but no implementation-plan format file exists in formats/. This means:

• The bootstrap engine cannot assemble a complete prompt with output structure rules
• The output structure for implementation plans is defined ad-hoc in the template body, not in a reusable format component
• These templates violate the composition model (persona + protocols + format + template)

Fix options:

1. Create formats/implementation-plan.md defining the output structure, then add format: implementation-plan to both templates and the manifest
2. If the templates intentionally define their own structure inline, document this as a supported pattern and update CONTRIBUTING.md

Convention reference

Per CONTRIBUTING.md, template frontmatter MUST include: name, description, persona, protocols, format, params, input_contract, output_contract.

Affected files

• templates/review-code.md (missing format in frontmatter)
• templates/plan-implementation.md (missing format everywhere)
• templates/plan-refactoring.md (missing format everywhere)
• manifest.yaml (missing format for plan-implementation, plan-refactoring)
  </issue_description>

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

• Fixes Template frontmatter missing format field; implementation-plan format does not exist #19

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