The agent's CurrentVersion includes the "v" prefix (e.g., "v4.33.1") but
the server's /api/agent/version endpoint returns versions without it
(e.g., "4.33.1"). This caused the comparison to always fail, triggering
an infinite self-update loop every 30 seconds.
Normalize both versions by stripping the "v" prefix before comparison.
Related to #740
When the agent binary is symlinked (e.g., from /opt/pulse/bin to
/usr/local/bin), the self-update would fail with "invalid cross-device
link" because os.Rename() doesn't work across filesystems.
Now resolves symlinks before update and creates the temp file in the
same directory as the real binary.
Related to #737
Implement self-update capability for the unified pulse-agent binary:
- Add internal/agentupdate package with cross-platform update logic
- Hourly version checks against /api/agent/version endpoint
- SHA256 checksum verification for downloaded binaries
- Atomic binary replacement with backup/rollback on failure
- Support for Linux, macOS, and Windows (10 platform/arch combinations)
Build and release changes:
- Dockerfile builds unified agent for all platforms
- build-release.sh includes unified agent in release artifacts
- validate-release.sh validates unified agent binaries
- Install scripts (install.sh, install.ps1) use correct URL format
Related to #727, #737
