v0.83.0: observability pass — always-DEBUG capture ring + GET /debug/logs + heartbeat log-pull + gap-fill sweep
Capture layer: applog.New returns (logger, Ring) — slog fan-out, stderr at the
configured level, ~1000-entry ring fixed at LevelDebug (remote diagnostics
without a config flip). GET /debug/logs (token-authed, ?raw=1) + request-level
DEBUG middleware. Heartbeat log-pull mirrors the report logtail pattern:
envelope log_tail_requested -> next heartbeat carries log_tail (128KB cap,
consume-once, failed-push retry proven). Gap-fill sweep over netverify/
netstorage/netmount/signedjobs/selfupdate/disks/controller-swap/desired/loop.
Red-proofs: ring-at-emit-level FAILs capture test; drain removed FAILs
consume-once; dropped phase line FAILs the S7 log-sequence smoke.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PSK5g6qYLknKj8u3QAFEr6
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