Test Details Overview

Log available disk space for the ledger database (#5177)

Record the free space on the volume holding the ledger at startup and on
every monitor tick, so operators notice a filling disk and post-mortem log
analysis can tell whether the node ran out of space.

Add `nano::get_disk_space` alongside the other filesystem helpers and a
`nano::log::as_disk_space` wrapper to render it, keeping the formatting out
of the query API. The monitor escalates to a warning below 10 GiB and to a
critical message below 1 GiB.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

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Type: commit

Hash: 89b849c4782eeb621c37553ff5bca90646da6a9e

Created: yesterday

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gr0v1ty/nano-node:89b849c4782eeb621c37553ff5bca90646da6a9e