fix(openclaw): restore native cron store path

[mostlydev]

Summary

• restore the OpenClaw native cron store mount at ~/.openclaw/cron and write jobs.json there instead of under the config directory
• keep pod-origin OpenClaw wakes on the documented openclaw cron run <id> contract and lock the expectation with schedule-manifest tests
• document the scheduling ownership rule in generated CLAWDAPUS.md and update the changelog / decision note to match the actual runtime contract

Root Cause

Clawdapus was generating OpenClaw cron definitions under the config directory, but current OpenClaw builds read cron definitions from ~/.openclaw/cron/jobs.json. That left openclaw cron list empty in live pods and caused openclaw cron run <id> to fail with unknown cron job id even though Clawdapus believed the jobs had been compiled.

Validation

• go test ./...

Notes

• This PR is the narrow cron-restoration fix needed to get Tiverton's scheduled jobs compiling into the store OpenClaw actually reads.
• Broader managed-service freeze / health-check hardening remains follow-up work.

Closes #159
Refs #160