The single InstalledDistScanBudget is consumed across all three prune
walks (legacy-deps prepass, dist file listing, empty-dir sweep). During
an npm upgrade the dist dir transiently holds old+new content-hashed
files, so a real upgrade scan totals ~24k entries against the 25k cap;
one more release of dist growth would make 'npm install -g openclaw'
throw InstalledDistScanLimitError for every upgrading user. Raise the
cap to 100k for real headroom while keeping the unbounded-scan guard,
and ratchet the cap in the test so it cannot be lowered back.
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