Anonymized systems debugging case notes tracing how production fault boundaries move before the real cause is found.https://stellanlee.dev/https://stellanlee.dev/case-notes/agent-runtime-toolchain/https://stellanlee.dev/case-notes/agent-runtime-toolchain/An agent workflow stopped working, but recent repository changes did not explain the failure.https://stellanlee.dev/case-notes/mysql-shared-library/https://stellanlee.dev/case-notes/mysql-shared-library/A customer-site MySQL service failed to start, and normal database-level checks did not explain the issue.https://stellanlee.dev/case-notes/edge-device-ip-conflict/https://stellanlee.dev/case-notes/edge-device-ip-conflict/An edge device appeared unstable through remote access tooling, but the actual failure was inside the local network.