Append 2026-03-14 session entry — dev container provisioning stabilization

SESSION_LOG.md

@@ -13,3 +13,70 @@
   - Frontend/TerminalView_Component.md — created; includes reconnect behavior (1–5s backoff, no page refresh required)
   - ZeroLagHub_Quick_Status_Feb2026.md — created; reflects March 2026 operational state
   - Session_Summaries/2026-03-10_Agent_Observability_Update.md — created; structured logging, crash metadata fields, ReadinessTimeout constant, crash semantics unchanged
+
+---
+
+## 2026-03-14
+
+Goal:
+Stabilize dev container provisioning across agent, portal, and artifact server.
+
+Scope:
+
+- catalog-driven runtime installs
+- dotnet runtime support
+- dev workspace environment
+- portal provisioning updates
+
+Explicit non-goals:
+
+- platform architecture changes
+- container orchestration changes
+
+Canonical refs used:
+
+- ZeroLagHub knowledge base
+- dev runtime provisioning spec
+
+Work completed:
+
+Agent:
+
+- switched dev runtime validation to artifact catalog
+- runtime installs moved to `/opt/zlh/runtimes`
+- implemented runtime install guards
+- implemented dev user environment
+- updated dev shell to run as `dev`
+- added dotnet runtime provisioning
+- added optional code-server provisioning
+
+Portal:
+
+- added dotnet runtime
+- added enable code-server option
+- enabled Files tab for dev containers
+- dev file uploads now current-directory based
+
+API:
+
+- added `enable_code_server` field to dev provisioning payload
+
+Artifact Server:
+
+- runtime artifacts verified
+- dotnet installer aligned with artifact fetch model
+
+Issues discovered:
+
+- code-server artifact contains repository source
+- installer expects packaged release
+
+Resolution:
+Artifact server must provide compiled code-server release archive.
+
+Current system state:
+
+- dev runtime provisioning operational
+- dotnet runtime operational
+- portal provisioning operational
+- code-server blocked by artifact packaging