docs(research): capture direct Copilot sandbox ptrace probe results

research/copilot-coding-agent-ptrace-results.md

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+# Copilot coding-agent ptrace compatibility results
+
+Direct run in the GitHub Copilot coding-agent sandbox (ordinary agent user, no delegation).
+
+## Scope and inputs
+- Repository: `voidzero-dev/vite-task`
+- Working area: `research/` only
+- Probe source compiled: `research/ptrace-environment-probe.c`
+- Compile command: `gcc -O2 -Wall -Wextra -Werror research/ptrace-environment-probe.c -o /tmp/ptrace-environment-probe`
+- Exec-boundary injection primitive probe on base branch (`origin/main`): `research/ptrace-exec-injection-primitives-probe.c` **absent** (not recreated)
+
+## Environment capture
+
+### `uname -a`
+```text
+Linux runnervm76f27 6.17.0-1022-azure #22-Ubuntu SMP Mon Jul 27 17:24:03 UTC 2026 x86_64 x86_64 x86_64 GNU/Linux
+```
+
+### `/etc/os-release`
+```text
+PRETTY_NAME="Ubuntu 24.04.4 LTS"
+NAME="Ubuntu"
+VERSION_ID="24.04"
+VERSION="24.04.4 LTS (Noble Numbat)"
+VERSION_CODENAME=noble
+ID=ubuntu
+ID_LIKE=debian
+HOME_URL="https://www.ubuntu.com/"
+SUPPORT_URL="https://help.ubuntu.com/"
+BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
+PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
+UBUNTU_CODENAME=noble
+LOGO=ubuntu-logo
+```
+
+### `id`
+```text
+uid=1001(runner) gid=1001(runner) groups=1001(runner),4(adm),100(users),118(docker),999(systemd-journal)
+```
+
+### `/proc/self/status` fields
+```text
+CapEff:	0000000000000000
+NoNewPrivs:	0
+Seccomp:	0
+```
+
+### `kernel.yama.ptrace_scope`
+```text
+1
+```
+(readable: yes)
+
+### cgroup/container hints
+```text
+/proc/self/cgroup:
+0::/user.slice/user-0.slice/session-c1.scope/ebpf-cgroup-firewall
+
+/proc/1/cgroup:
+0::/init.scope
+
+/.dockerenv: absent
+/run/.containerenv: absent
+systemd-detect-virt -c: none
+```
+
+## Probe build and execution
+
+### Compilation result
+```text
+compile_exit_status=0
+```
+
+### Complete `ptrace-environment-probe` output
+```text
+pid=4066 uid=1001 euid=1001
+CapEff:	0000000000000000
+NoNewPrivs:	0
+Seccomp:	0
+YamaScope:	1
+traceme+exec+regset            result=PASS errno=0 (none) SIGTRAP exec-stop
+attach-direct-child            result=PASS errno=0 (none) 
+seize-direct-child             result=PASS errno=0 (none) 
+process-vm-write               result=PASS errno=0 (none) direct child
+process-vm-read                result=PASS errno=0 (none) direct child
+seize-live-grandchild          result=PASS errno=0 (none) ancestor, not direct parent
+seize-sibling                  result=FAIL errno=1 (Operation not permitted) same UID
+seize-sibling-pr-set-ptracer   result=PASS errno=0 (none) target opted in
+seize-dumpable-zero-child      result=FAIL errno=1 (Operation not permitted) 
+seize-orphan-no-subreaper      result=FAIL errno=1 (Operation not permitted) reparented away
+seize-orphan-subreaper         result=PASS errno=0 (none) reparented to supervisor
+probe_exit_status=0
+```
+
+No compilation or execution blocker was encountered in this sandbox run.