chore: update OpenAPI spec from monorepo (#758)

Co-authored-by: OpenRouter SDK Bot <sdk-bot@openrouter.ai>

Author: openrouter-docs-sync[bot]

.speakeasy/in.openapi.yaml

@@ -27433,9 +27433,13 @@ paths:
                 time_range:
                   properties:
                     end:
+                      description: 'ISO 8601 UTC timestamp. Must include seconds (YYYY-MM-DDTHH:MM:SSZ; fractional seconds allowed); minute-precision timestamps are rejected.'
+                      example: '2027-12-31T23:59:59Z'
                       format: 'date-time'
                       type: 'string'
                     start:
+                      description: 'ISO 8601 UTC timestamp. Must include seconds (YYYY-MM-DDTHH:MM:SSZ; fractional seconds allowed); minute-precision timestamps are rejected.'
+                      example: '2027-12-31T23:59:59Z'
                       format: 'date-time'
                       type: 'string'
                   required:
@@ -28011,7 +28015,7 @@ paths:
                   example: 'S256'
                   type: 'string'
                 expires_at:
-                  description: 'Optional expiration time for the API key to be created'
+                  description: 'Optional ISO 8601 UTC expiration timestamp. Must include seconds (YYYY-MM-DDTHH:MM:SSZ; fractional seconds allowed); minute-precision timestamps are rejected.'
                   example: '2027-12-31T23:59:59Z'
                   format: 'date-time'
                   type:
@@ -33721,7 +33725,7 @@ paths:
                     - 'string'
                     - 'null'
                 expires_at:
-                  description: 'Optional ISO 8601 UTC timestamp when the API key should expire. Must be UTC, other timezones will be rejected'
+                  description: 'Optional ISO 8601 UTC expiration timestamp. Must include seconds (YYYY-MM-DDTHH:MM:SSZ; fractional seconds allowed); minute-precision timestamps are rejected.'
                   example: '2027-12-31T23:59:59Z'
                   format: 'date-time'
                   type: