Checkpoint web parity through Chromium input tasks

docs/status/M13-04E.md

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+# M13-04E Status
+
+status: done
+task: pinned Blender server startup
+updated: 2026-08-19 America/New_York
+enablingTask: false
+parityStateChange: false
+
+Pinned Blender 5.2.0 LTS now passes a real server preflight using only `--background`,
+`--factory-startup`, the fixed `tools/web/server-job-startup.py`, and a fixed business argument.
+The structured receipt confirms background mode, runtime version and argv. Execution remains
+`DISABLED`; this task does not claim result publication.
+
+Evidence: `node tools/web/check-server-job-startup.mjs` output
+`server-job-startup-ok blender=5.2 background=1 factory=1 userPrefs=0 fixedScript=1 execution=DISABLED next=M13-04F`;
+typecheck, lint and `git diff --check` passed. Artifact hashes: startup
+`c8c5b5a7a7880d4df9477a94a98e54e328baf582ade649807067f988484e1f12`, checker
+`66b2e25efe0e7455348e8f488cd0f6ebef07f916fcf6541680e7d18e4f69ab10`, report
+`c67d2972e584782d03479dbdb36dae0976074978f4ce9a48e41e7ad5aea66089`, manifest
+`a24ea87bcf305bc15d8ae70b2abd03aa16ffbd6b127d5e9da9da23617d7201cc`.
+
+Next task: `M13-04F`, bounded and redacted stdout/stderr.