Add Apple Silicon GPU monitoring and publish as System Vitals

[sachinsachdeva]

Adds GPU monitoring on macOS and prepares the fork to be published under its own marketplace identity.

GPU monitoring

systeminformation cannot supply GPU utilization on macOS — si.graphics() shells out to system_profiler, costs ~230ms, and has no utilization field. Statistics instead come from the IOKit registry via ioreg -r -d 1 -w 0 -c IOAccelerator, which takes ~20ms and needs no elevated privileges, unlike powermetrics.

Two independently toggleable resources: GPU utilization and GPU memory. Availability is gated on whether a machine actually reports usable statistics rather than on architecture, so this covers Intel Macs too and stays hidden everywhere else.

GPU memory reads as in use / allocated, not used-of-VRAM — Apple Silicon has unified memory with no fixed GPU partition, so the denominator is what the driver has currently claimed.

The sampler caches for 100ms so one tick costs a single ioreg call across both resources, and resolves to null rather than rejecting on failure. That last part matters: ResMon.update() gathers resources with Promise.all and has no error handling, so one rejection would break the setTimeout chain and freeze the entire status bar.

Packaging fix

systeminformation was listed in both dependencies and devDependencies, and the lockfile recorded it "dev": true. vsce pruned it and produced a VSIX with no node_modules at all, so an installed build died on activation at require('systeminformation'). Running from source with F5 was unaffected, which is why it went unnoticed.

Rebrand

Published as sachinsachdeva.system-vitals, version reset to 1.0.0. New icon, since the previous one was the upstream author's artwork. LICENSE.md records that upstream declares no license, so redistribution terms are unresolved, and that only the changes made here are ours to license.

Settings move from resmon.* to systemvitals.* so the two extensions stay independent when both are installed. Existing settings do not migrate.

Activation moves from * to onStartupFinished, which requires VS Code 1.53. That forced @types/vscode in place of the deprecated vscode module, and TypeScript 2.6 to 5.9. One line of source changed: a meaningless async on an abstract declaration, which TypeScript 4+ rejects.

Bug fixes

• Settings were frozen at activation. Each Resource held the WorkspaceConfiguration snapshot it was constructed with, so show.* and unit changes needed a window reload. Now pushed to each resource per tick.
• That exposed a second issue: _maxWidth only grows, so a setting that shortens a display left the bar padded at the old width. A configuration listener now resets it.
• Memory read 'memunit' instead of the contributed 'mem.unit', so it always rendered GB.
• convertBytesToLargestUnit labelled units from the enum, yielding "G" and "None" instead of "GB" and "B".
• The base isShown() hardcoded false instead of using _isShownByDefault, making that argument dead.
• Removed the unfinished Network resource, which logged every interface to the console on activation and returned "". With isShown() honouring _isShownByDefault it would have started rendering an empty column.

Verification

• Parser matched grep exactly on identical captured ioreg text across three snapshots; empty, garbage, truncated and missing-key inputs all return null without throwing; the "In use system memory (driver)" sibling key is not mistaken for the real one.
• Sampler: 4 concurrent reads produce 1 spawn, cached reads produce 0, ioreg unreachable resolves null without rejecting, and non-darwin returns null with zero spawns.
• End-to-end against a stubbed vscode API across six configurations — defaults, GPU memory on, gpu.unit: MB, precision: 0, both toggles off, and forced non-macOS.
• Live settings changes verified mid-session with no reload and no re-activation.
• vsce packages with zero warnings and no override flags, where it previously needed --allow-star-activation and --allow-missing-repository.

Not yet verified: installing the VSIX and exercising the onStartupFinished path inside a real editor.