real dev verification, PR 27651
main: ce48e45900
head: b679dd227c124d0207a86c03a3cfce001399812e

Installed Antigravity 1.4.1 using Settings > Providers > Install Antigravity.
Started Google sign-in using the client. Captured its genuine 168 KiB runtime directory (3 regular files and log symlinks), cancelled/shut down, and reused the same snapshot for both server startups. No synthetic runtime payload.

MAIN (actual server startup, strace):

1793508535.253712 unlink("/home/user/main/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd/run-nlvrw2/agy_acp_server.par.INFO") = 0
1793508535.253970 unlink("/home/user/main/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd/run-nlvrw2/agy_acp_server.par.WARNING") = 0
1793508535.254059 unlink("/home/user/main/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd/run-nlvrw2/agy_acp_server.par.box-node-b327c1836a0e1584.user.log.INFO.20261101-044641.34319") = 0
1793508535.254133 unlink("/home/user/main/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd/run-nlvrw2/agy_acp_server.par.box-node-b327c1836a0e1584.user.log.WARNING.20261101-044641.34319") = 0
1793508535.254257 unlink("/home/user/main/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd/run-nlvrw2/cacerts__py_binary_resource_agy_acp_server__l35_0ncr.txt") = 0
1793508535.255028 rmdir("/home/user/main/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd/run-nlvrw2") = 0
1793508535.255384 rmdir("/home/user/main/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd") = 0

PR (actual server startup, strace):
1793508590.008482 rename("/home/user/t3code/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd", "/home/user/t3code/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd.old-HKlslt/runtime") = 0
1793508590.126807 unlink("/home/user/t3code/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd.old-HKlslt/runtime/run-nlvrw2/agy_acp_server.par.INFO") = 0
1793508590.127138 unlink("/home/user/t3code/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd.old-HKlslt/runtime/run-nlvrw2/agy_acp_server.par.WARNING") = 0
1793508590.128436 unlink("/home/user/t3code/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd.old-HKlslt/runtime/run-nlvrw2/agy_acp_server.par.box-node-b327c1836a0e1584.user.log.INFO.20261101-044641.34319") = 0
1793508590.128662 unlink("/home/user/t3code/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd.old-HKlslt/runtime/run-nlvrw2/agy_acp_server.par.box-node-b327c1836a0e1584.user.log.WARNING.20261101-044641.34319") = 0
1793508590.128836 unlink("/home/user/t3code/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd.old-HKlslt/runtime/run-nlvrw2/cacerts__py_binary_resource_agy_acp_server__l35_0ncr.txt") = 0
1793508590.136875 rmdir("/home/user/t3code/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd.old-HKlslt/runtime/run-nlvrw2") = 0
1793508590.140000 rmdir("/home/user/t3code/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd.old-HKlslt/runtime") = 0
1793508590.143746 rmdir("/home/user/t3code/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd.old-HKlslt") = 0
1793508655.238519 unlink("/home/user/t3code/.t3/userdata/antigravity-tmp/ac0a3dfd6ddd/run-aRWY7h/akux723v") = 0

/home/user/main actual trace spans:
{"name":"removeAntigravityRuntimeTempDirs","start":"1793508535235644836","end":"1793508535254646557","exit":{"_tag":"Success"}}
{"name":"removeAntigravityRuntimeTempDirs","start":"1793508535254837156","end":"1793508535256012604","exit":{"_tag":"Success"}}
{"name":"AntigravityDriver.create","start":"1793508535235020854","end":"1793508535259316231","exit":{"_tag":"Success"}}

/home/user/t3code actual trace spans:


PR rename succeeded before driver creation returned; retired-file deletion continued afterward. The small Linux runtime finished deleting before HTTP readiness, so no Windows speedup claim is made.
Real Codex gpt-6.1-sol turns completed in the web client on main and PR.
Focused Blacksmith tests: 2 files, 6 tests passed.

PR trace spans from rotated trace file:
{"name":"retireAntigravityRuntimeTempDirs","start":"1793508589994160140","end":"1793508590009293297","exit":{"_tag":"Success"}}
{"name":"retireAntigravityRuntimeTempDirs","start":"1793508590009386623","end":"1793508590010088881","exit":{"_tag":"Success"}}
{"name":"AntigravityDriver.create","start":"1793508589993056577","end":"1793508590012917755","exit":{"_tag":"Success"}}
Neighbor checks: PR sign-in reached Google handoff; cancellation removed run-* and exposed Retry sign-in; retry reached handoff again. Empty-root PR restart listened successfully on port 13773 and retained provider settings. No source changes. Windows/macOS/mobile and authenticated Antigravity generation not exercised.