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taylanbakircioglu
27fbe48c4b
A self-hosted agent could fail every heartbeat with HTTP 400 `Invalid JSON: Expecting property name enclosed in double quotes` when the system-info block it collects came back empty on an unusual host. The agent builds the heartbeat JSON as text, so an empty `$system_info` collapsed the `$system_info,` line to a bare comma and broke the payload. - Agent script (linux + macos, kept in sync): guard the fragment-form register_agent and send_heartbeat builders so an empty system_info falls back to a valid key and can never emit a bare comma. Uses the most portable bash glob test (no POSIX class / pattern substitution; verified on bash 3.2-5.2 and on Ubuntu/Debian/Rocky/Alpine/Amazon Linux). True no-op for healthy agents. - Backend heartbeat endpoint: parse the body as-is first and only run the malformed-JSON repair when parsing fails, so a valid heartbeat from any agent version is byte-for-byte untouched. The repair (now a testable helper) recovers a leading or doubled comma (the empty-system_info artifact) in addition to the existing empty-value / trailing-comma fixes. No agent version bump; self-upgrade and daemon mode are unaffected. Healthy agents of every version behave identically. Full backend suite green. Addresses #31.