feat: add simslim top — live fleet monitor with per-daemon drill-down

[Interlap01]

What

simslim top — a top(1) for the simulator fleet, plus simslim list --booted.

Fleet view (live, 2s refresh):

SIMULATOR                      OS     STATE   PROC    CPU      RAM     DISK
iPad Air 13-inch (M2) · 0D38E… 17.5   stock    181     1%     3.4G     2.8G
iPhone 16 · 5D8D68E7           18.3   stock    167     4%     3.2G     6.1G
iPhone 17 · AEE905BA           26.4   slim      77     0%     1.3G     4.4G
iPhone 17 Pro · 7D5CE770       27.0   slim      64     1%   961.8M     4.4G
7 booted · total 16.8G · ↑↓ select · ↵ open · sort n·o·s·p·c·m·d · q quit

• Enter a row (or simslim top <udid>) → that simulator's per-daemon RAM/CPU breakdown, scrollable.
• Sorting on every column (n·o·s·p·c·m·d, press again to flip); OS uses a version-aware comparator so 9.0 < 26.4.
• Responsive: the name column flexes to the terminal width.
• --json / piped output: one-shot snapshots (fleet or per-daemon) — same JSON-contract style the GUI decodes.

How

• Library stays dependency-free. MeasureProcesses keeps the per-process footprint+cpu that measureTree used to discard (one shared ps/top snapshot); fleet.go's FleetSnapshot composes booted devices + slim status + MeasureMany, fanning the per-device status reads out in parallel so first paint waits on the slowest device, not the sum.
• TUI is CLI-only (cmd/simslim/top.go): bubbletea + lipgloss join urfave/cli as the CLI's deps; importers of the library inherit none of it.
• Robustness: cursor anchors to the selected sim's UDID across live re-sorts; transient refresh errors keep the last snapshot and report in the footer; disk (du) sweeps are TTL'd (30s) and guarded against overlap; /dev/null-style non-TTYs correctly fall back to static output via go-isatty.

Also: simslim list --booted filters the listing (text and --json) to booted simulators.

Testing

• Pure unit tests as usual (no sim boots): ps parsing, tree aggregation with cycles, sort/reanchor/version-compare logic, formatting, static render.
• make check green; smoke-tested live against 7 booted simulators (mixed stock/slim, iOS 17.5–27.0).