docs: add symptom-first troubleshooting guides - #1296

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Jeff Luo (JeffLuoo) wants to merge 1 commit into

agent-substrate:mainfrom

JeffLuoo:troubleshooting-guide

Google CLA / cla/google succeeded Aug 28, 2026 in 7s

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✅ 77863cb Author: @JeffLuoo <je****oo@google.com>

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