Fix OpenClaw cron timeouts and portable memory permissions

[mostlydev]

This pull request introduces two main improvements: (1) it allows the job invocation timeout to be configured via the agents.defaults.timeoutSeconds setting, with robust validation and tests, and (2) it ensures that all files and directories in the portable memory directory have normalized, permissive permissions, also with thorough test coverage.

Job invocation timeout configurability and validation:

• Added support for configuring the job payload timeoutSeconds via the agents.defaults.timeoutSeconds setting in the resolved configuration, falling back to a default of 300 seconds if not set. The value is parsed and validated to ensure it is a positive integer, with error handling for invalid values. [1] [2] [3] [4]
• Added tests to verify the default timeout, the use of a configured timeout, and proper error handling for invalid timeout values. [1] [2]

Portable memory permissions normalization:

• Modified PreparePortableMemory to ensure all files are set to 0666 and directories to 0777 permissions, regardless of their previous state, by adding a normalizePortableMemoryPermissions function.
• Added a test to confirm that existing files and directories in the portable memory directory are normalized to the correct permissions.

[mostlydev]

Code review

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