[autodev] fix Tier-1 e2e docker harness drift

Bugs found during Step 11 (Run Tests) functional gate:

1. e2e/docker/docker-compose.test.yml referenced docker/Dockerfile
   (doesn't exist). Renamed to docker/companion-tier1.Dockerfile.

2. fdr-output volume declared tmpfs size=64g, which requires actual host
   RAM. Docker Desktop on macOS has only ~3.8 GiB; tmpfs alloc fails.
   Switched to a plain named volume (the SUT enforces the 64 GB cap
   internally per NFT-LIM-02; the volume-layer cap was belt-and-
   suspenders only). Documented the overlay2+xfs override path for CI
   runners that support it.

3. Added e2e-results/ to .gitignore (runtime output dir created by
   the bind-mount).

These bugs predate this session; the harness had never been bench-tested
end-to-end. Surfacing them was the actual outcome of running test-run.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -57,6 +57,7 @@ Thumbs.db
 /var/lib/gps-denied/
 fdr_output/
 tile_cache/
+e2e-results/
 
 # Secrets
 .env