Add agent observability session summary 2026-03-10

Session_Summaries/2026-03-10_Agent_Observability_Update.md

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+# Agent Observability Update
+
+Date: 2026-03-10
+
+This session improved agent observability without altering crash semantics or restart behavior.
+
+---
+
+## Structured Logging
+
+Operational logs now use component tags:
+
+- `[process]`
+- `[http]`
+- `[files]`
+- `[console]`
+- `[state]`
+
+Each log entry includes the VMID when available.
+
+---
+
+## Crash Metadata
+
+The agent now records and exposes via `/status`:
+
+- `lastCrashTime`
+- `lastCrashExitCode`
+- `lastCrashSignal`
+- `lastCrashUptimeSeconds`
+- `lastCrashLogTail`
+
+---
+
+## Readiness Timeout
+
+A constant was introduced:
+
+```go
+const ReadinessTimeout = 60 * time.Second
+```
+
+This centralizes the readiness policy and allows tuning without searching for hardcoded values.
+
+---
+
+## Crash Semantics
+
+Crash classification unchanged:
+
+```
+unexpected exit  →  crashed
+intentional stop →  idle
+readiness failure → error
+```
+
+This ensures crash metrics remain accurate and are not inflated by intentional operations.