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swayfx-mosaic/tooling/probes/step20c-saved-transaction-buffer/README.md

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Saved transaction buffer source fixture

EXPERIMENTAL / INCONCLUSIVE. The protocol and source audit are in the report. This directory preserves only reviewed source. It does not add a production dependency or authorize a SceneFX merge. Generated builds, sockets, captures, large logs and results belong under a private LAB outside Git.

prepare.sh reconstructs pinned disposable sources and compiles the C17 controlled XDG client. run.py LAB MODE reserves a locked persistent budget before a headless run; modes are control, private_standard and private_mosaic, once each. analyze.py LAB derives a bounded matrix from the raw event/PNG files and writes manifests. test-budget.py exercises the ledger without launching a compositor. No command may use the daily IPC socket; runner IPC always passes swaymsg -s with the private socket.

For the completed campaign, use each run's manifest-covered runs/*/fixture-source.py to reconstruct the exact executed code. The current run.py matches the final private Mosaic copy (SHA-256 cdece69cf956e550779bd992b0d38234629ca1e611dfb3fb0348c04841c47f59). The pristine copy (bc041eb7be89da9e198bb9ca2e25cfe86467c264e3687e6d9d3f3836e82ce40c) had no pointer injector. The private-standard copy (67aa3fb94901739bea0b1d0e0cf881081d2388a02256dddc45282d7a4bc86b25) added six retained-window pointer actions; they delayed its valid ACK past timeout. The final copy removed those actions. Do not rerun this exhausted campaign or treat the current source as identical to all historical runs.

The default transaction timeout is 200 ms; the fixture requests -Dtxn-timeout=1200 for each comparable mode. A source trace, configure hold and a screenshot alone do not establish saved-buffer rendering: the saved node must be nonempty, enabled, in the render list, and geometrically cross the tested boundary. Missing observations are NOT EXERCISED or INCONCLUSIVE. Historical ledgers are separate and never reset. The completed LAB is /tmp/swayfx-mosaic-nested-grab-KYJ2pj1o; its ledger has one run per mode. Do not rerun a mode or reset this ledger. The private-standard ACK episode timed out during slow fixture input, and the Mosaic target camera settled at 1760, leaving its snapshot outside H1. The partial-overflow gate is NOT EXERCISED; see the report for exact limits.