Add declarative heartbeat candidate

[DonnieDice]

Summary

• move the three-tick reference heartbeat to declarative every.heartbeat
• add an explicit delayed in-game self-cancellation check
• mark RGX-Hello 1.3.0 as an unreleased source candidate requiring Framework 2.7.0
• keep MCP framed as private source-contract conformance plumbing for future Studio work

Verification

• Framework Lua 5.1 runtime harness: 166 checks
• RGX-Hello Lua syntax: 2 files, 0 errors
• schema: 14 behavior vectors
• source conformance E2E against this checkout: passed
• git diff --check: passed

Manual gate

Do not tag or publish 1.3.0 until Framework #29 passes the in-game heartbeat check.

[coderabbitai]

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[DonnieDice]

Canonical development moved to GitLab MR !3: https://gitlab.dicematrix.cloud/rgxmods/warcraft/RGX-Hello/-/merge_requests/3. GitHub remains the downstream mirror; this PR is closed without merging.