feat: Add YAGNI semantic anchor

[Nantero1]

Summary

• Adds YAGNI (You Aren't Gonna Need It) as a standalone semantic anchor
• Promotes from sub-bullet in Chicago School TDD to independent entry
• Includes anchor file, all-anchors include, and AgentSkill catalog entry

Why this anchor?

YAGNI activates: Ron Jeffries/XP, don't build for hypothetical future requirements, speculative generality anti-pattern, incremental design, delete dead code, cost of carry.

Distinct from: DRY (eliminates duplication of existing knowledge), KISS (simplicity of what exists). YAGNI = don't add what's not needed yet.

Currently only a sub-bullet in tdd-chicago-school.adoc — deserves standalone entry as a widely-used design principle in its own right.

Files changed

• docs/anchors/yagni.adoc — new anchor file
• docs/all-anchors.adoc — added include in Design Principles section
• skill/semantic-anchor-translator/references/catalog.md — added catalog entry

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📒 Files selected for processing (3)

• docs/all-anchors.adoc
• docs/anchors/yagni.adoc
• skill/semantic-anchor-translator/references/catalog.md

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[raifdmueller]

Review: ✅ Excellent anchor, merge-ready.

YAGNI is a textbook semantic anchor — precise, universally known, clearly attributable (Ron Jeffries/Kent Beck). Content is strong, good distinction from DRY.

Post-merge TODO:

• Add German translation (yagni.de.adoc)

Merging recommended, translation will follow in batch (see #149).

[raifdmueller]

Replaced by #152 (rebased on current main to resolve merge conflicts). Content is identical to your original PR. Thank you!