fix: resolve Helm chart configuration validation errors (#1410)

* fix: resolve Helm chart configuration validation errors

This commit fixes three configuration validation issues in the Helm chart
introduced in PR #1400:

1. OBSERVABILITY_EXCLUDE_PATHS: Changed from comma-separated string to
   JSON array format to match Pydantic List[str] type expectations
   - Before: "/health,/healthz,/ready,/metrics,/static/.*"
   - After: '["\/health", "\/healthz", "\/ready", "\/metrics", "\/static\/.*"]'
   - Error fixed: json.decoder.JSONDecodeError and pydantic_settings.SettingsError

2. PLUGINS_CLI_MARKUP_MODE: Set default value to "rich" instead of
   empty string to satisfy Pydantic Literal type validation
   - Before: ""
   - After: "rich"
   - Valid options: "markdown", "rich", "disabled", or None
   - Error fixed: pydantic_core._pydantic_core.ValidationError

3. fast-time-server version: Updated to latest stable release
   - Before: "0.9.0"
   - After: "0.8.0"

These changes prevent validation errors during application startup
when deploying via Helm.

Signed-off-by: ppippi <[email protected]>
Signed-off-by: ppippi-dev <[email protected]>

* 0.9.0 tag

Signed-off-by: Mihai Criveti <[email protected]>

---------

Signed-off-by: ppippi <[email protected]>
Signed-off-by: ppippi-dev <[email protected]>
Signed-off-by: Mihai Criveti <[email protected]>
Co-authored-by: Mihai Criveti <[email protected]>

Author: ppippi-dev

charts/mcp-stack/values.yaml

@@ -305,7 +305,7 @@ mcpContextForge:
     PLUGINS_MTLS_VERIFY: "true"              # verify remote plugin certificates
     PLUGINS_MTLS_CHECK_HOSTNAME: "true"      # enforce hostname verification when verifying certs
     PLUGINS_CLI_COMPLETION: "false"  # enable auto-completion for plugins CLI
-    PLUGINS_CLI_MARKUP_MODE: ""      # set markup mode for plugins CLI
+    PLUGINS_CLI_MARKUP_MODE: "rich"  # set markup mode for plugins CLI (rich, markdown, or disabled)
 
     # ─ OpenTelemetry Observability ─
     OTEL_ENABLE_OBSERVABILITY: "true" # master switch for observability
@@ -323,7 +323,7 @@ mcpContextForge:
     OBSERVABILITY_TRACE_RETENTION_DAYS: "7"      # number of days to retain trace data
     OBSERVABILITY_MAX_TRACES: "100000"           # maximum number of traces to retain
     OBSERVABILITY_SAMPLE_RATE: "1.0"             # trace sampling rate (0.0-1.0, 1.0 = trace everything)
-    OBSERVABILITY_EXCLUDE_PATHS: "/health,/healthz,/ready,/metrics,/static/.*" # paths to exclude from tracing
+    OBSERVABILITY_EXCLUDE_PATHS: '["/health", "/healthz", "/ready", "/metrics", "/static/.*"]' # paths to exclude from tracing
     OBSERVABILITY_METRICS_ENABLED: "true"        # enable metrics collection
     OBSERVABILITY_EVENTS_ENABLED: "true"         # enable event logging within spans