docs: add attribution for skills derived from amplifier

Credit amplifier repo (github.com/microsoft/amplifier @ 2adb63f)
for agent patterns that inspired these skills.

skills/architecture/ABOUT.md

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+# Architecture Skills - Attribution
+
+This skill was derived from agent patterns in the [Amplifier](https://github.com/microsoft/amplifier) project.
+
+**Source Repository:**
+- Name: Amplifier
+- URL: https://github.com/microsoft/amplifier
+- Commit: 2adb63f858e7d760e188197c8e8d4c1ef721e2a6
+- Date: 2025-10-10
+
+## Skills Derived from Amplifier Agents
+
+**From ambiguity-guardian agent:**
+- preserving-productive-tensions - Recognizing when disagreements reveal valuable context, preserving multiple valid approaches instead of forcing premature resolution
+
+## What Was Adapted
+
+The ambiguity-guardian agent preserves productive contradictions and navigates uncertainty as valuable features of knowledge. This skill extracts the core pattern-recognition capability: distinguishing when tensions should be preserved (context-dependent trade-offs) vs resolved (clear technical superiority).
+
+Adapted as scannable guide with symptom-based triggers ("going back and forth", "keep changing mind") and practical preservation patterns (configuration, parallel implementations, documented trade-offs).