feat: -p dlopen support#229
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Use an internal sysmon event mask so PID mode subscribes only to map-change events for the watched process, then refresh proc maps and incrementally load newly mapped DWARF modules before script compilation.
Add a dlopen-driven backtrace fixture that loads a shared object only after GhostScope is attached in -p mode. The test verifies rendered stacks resolve a frame from the newly mapped library. Refresh PID runtime modules before CLI/TUI backtrace rendering when sysmon reports map changes. Configure sysmon map-change filtering with the same PID namespace strategy used by the main -p trace, so private PID namespace targets do not drop dlopen mmap events before userspace can refresh proc maps.
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