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Gabriel
7f016da462
### What problem does this PR solve? The external file-cache tests depend on host disk/inode usage and inherited backend settings. Under resource-limit or advance-eviction mode, cache blocks can disappear between reads: the query-limit test observes an empty queue, the statistics test cannot establish stable hit/read counts, and the feature test times out while waiting for default flags to become zero. Establish a scoped baseline for these three non-concurrent suites. Disable upper read caches and inherited per-query limits, temporarily suppress advance eviction, and use 100% disk thresholds while retaining the failure for a genuinely full filesystem. Poll both mode flags across cache paths before measuring data. Restore every backend setting through the existing temporary-config helper, including on assertion failure. For the feature test, drive resource-limit entry with zero thresholds and advance-eviction entry with a one-percent threshold. A populated cache directory consumes an inode, whose used percentage rounds up to at least one. Nest threshold updates so the background monitor never observes an invalid enter/exit ordering during application or restoration. Keep the existing query results and cache assertions.