Add blueprint and reference implementation guidance docs

[danielgblanco]

Closes #348

Changes:

• Extracted advice and guidelines in templates and formatted them as their own docs
• Extended some advice on blueprints, in particular specific recommended best practices
• Added a link in issue templates to give visibility

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Pull request overview

This PR extracts embedded guidance from the blueprint/reference-implementation templates into standalone authoring-guideline docs, and updates GitHub issue templates to point contributors to those guidelines (closing #348).

Changes:

• Moved template guidance into architecture/blueprint-guidelines.md and architecture/reference-implementation-guidelines.md.
• Simplified the blueprint and reference-implementation templates to link to the new guideline docs.
• Updated issue templates to link to the new guidelines for visibility.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
architecture/reference-implementation-template.md	Replaces large embedded guidance comment blocks with a link to new authoring guidelines.
architecture/reference-implementation-guidelines.md	Adds standalone guidance previously embedded in the reference implementation template.
architecture/blueprint-template.md	Replaces embedded guidance comment block with a link to new blueprint authoring guidelines.
architecture/blueprint-guidelines.md	Adds standalone guidance previously embedded in the blueprint template, plus extended best practices.
.github/ISSUE_TEMPLATE/reference_implementation.yml	Adds a link to the new reference implementation guidelines in the issue form text.
.github/ISSUE_TEMPLATE/blueprint_proposal.yml	Adds a link to the new blueprint guidelines in the issue form text.

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[luke6Lh43]

This is a good cleanup, @danielgblanco! It keeps the templates focused, moves detailed guidance into discoverable documents, and links the issue forms to both the template and the authoring guidance. I left one minor wording suggestion; otherwise, this looks good to me.

[AndrejKiri]

LGTM!

[luke6Lh43]

LGTM!