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fix: add cgroup CFS throttling metrics to OTel meter (#1114)

Register four observable instruments on the existing MeterProvider to
surface container CPU bandwidth-control state so GC pauses can be
correlated with throttling in our observability backend:

- process.cpu.cfs.periods (counter)
- process.cpu.cfs.throttled_periods (counter)
- process.cpu.cfs.throttled_time (counter, ns)
- process.cpu.cfs.throttled_ratio (gauge, delta-based)

Supports cgroup v1 and v2, short-circuits cleanly on non-Linux and when
cpu.stat is unreadable, and reads the file from the OTel observable
callback (no separate timer).

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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