Changes touching this path

• the working-change artifact declares the fall-through its readers always had and the walk reader is the one recorded refuse-shaped exemption, and the test-side repo walk-up has one home in tests/common with main.rs named as its only twin (#1309) 51361264 · dbf3dbe6…
• eleven hand-rolled relay doubles become one TestRelay configured by value, so a withheld address and a pre-803 posture are settings that carry their tickets rather than structs re-declared under three names, and eighteen tests ask the seam instead of the repo 306942dd · dbf3dbe6…diff
• the composition TestRelay newly allows gets a test that fails if a fault is applied before the postures instead of after, a holding constructor absorbs the three hand-built relay fixtures, and the two invariants a comment was carrying say why they are load-bearing 34a33d0c · dbf3dbe6…diff
• test scratch directories are named by one shared helper, common::scratch, from the process id and a per-process counter rather than the clock, so two tests asking for one tag at once are no longer handed one directory that the second caller empties and refills (the #2258 mechanism): 19 test files under crates/*/tests named a temp_dir path from SystemTime nanoseconds in 21 statements and now call fresh_dir or fresh_path, loot-cli files reaching it through mod common and loot-first exit_codes compiling the same std-only file by path, and revset_everywhere and plaintext_equality_census, which already counted, call it too. scratch_dirs.rs holds the #2258 pin, moved from revset_everywhere and aimed at the shared helper, red under the clock naming in 13 runs of 13 (0 passed and 1 failed, 1 to 16 of 400 directories handed twice), and a guard that walks every .rs file under crates/*/tests and refuses a temp_dir statement that reads the clock, red over the unconverted tree naming the 19 files (1 passed and 1 failed), red with buoy_exit put back (1 and 1) and red when the walk finds nothing (0 and 1), each restored green. no other test changes what it asserts. the workspace suite is green (4533 passed over 140 binaries, 13 ignored, from 4532 over 139: the guard is new and the pin moved into its own binary). test-only, so it owes no deploy (#2358) 6dd1e05b · dbf3dbe6…diff

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