Diagnostic foundation for $B memory and the /memory endpoint that land
in the next two commits. Collects:
- Bun process memory via process.memoryUsage (cross-platform, accurate).
- Per-tab JS heap via CDP Performance.getMetrics, lazy per tracked page,
swallows target-died errors so a dying tab doesn't poison the
snapshot for the rest.
- Chromium process tree via SystemInfo.getProcessInfo (PID + type +
CPU time). RSS is NOT exposed via CDP — the eng review (D2 USE_CDP)
picked CDP over shelling to `ps`, so notes[] tells the caller why
the RSS column is absent and points at the follow-up TODO.
cdp-inspector exports getModificationHistoryStats so the snapshot can
surface buffer occupancy + cap + evicted count without reaching into
module-private state.
memory-snapshot.ts holds the shared types so server.ts and read-commands
can import without circular dep on browser-manager.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Garry Tan