S00-028: Record blocked task and remediation handoff

Changes: Preserve incomplete work and blocker metadata for S00-028. This checkpoint does not mark implementation accepted.
Validation: Session ended with status blocked.
Blocker: S00-028 cannot independently validate project filesystem sandbox: installed Codex sandbox exits before command execution because the app-server socket directory must be user-owned with mode 0700. Host socket repair is outside launcher arguments scope.
Automatic blocker limit reached; explicit external resolution required.

Task: S00-028
Agent: auto-ci-cd-211cf3a2bd08
Role: ci-cd
Action: claim
Status: blocked

Task title: Repair conflicting Codex harness sandbox arguments

state/evidence/S00-028-auto-ci-cd-211cf3a2bd08.md

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+# S00-028 launcher validation — incomplete
+
+Executor: auto-ci-cd-211cf3a2bd08 (ci-cd), 2026-10-15.
+Input: assigned card/packet and required documents; coordinator release-external event revision 77 in state/tasks.json. Output intended: compatible fresh launcher with project write sandbox. No source changes performed.
+
+## Findings
+
+Coordinator already removed the conflicting --sandbox before this session. Active argv: `codex -c sandbox_workspace_write.network_access=true exec --approve-for-me --ephemeral -`; commands_by_role is empty. Coordinator event records a subsequent fresh harness reaching its own escalation; this is historical evidence, not an independent fresh-model smoke check here. Original storage tasks were neither executed nor marked complete.
+
+Official reference opened: https://learn.chatgpt.com/docs/cli/reference . It documents --approve-for-me as automatic approval review with workspace-write, conflicting with --sandbox. Installed help agrees. The active configuration was preserved; no new model/agent was launched.
+
+## Actual commands/results
+
+- `python3 scripts/tasks.py resume --agent auto-ci-cd-211cf3a2bd08` and `show S00-028`: exit 0 each; assigned in_progress.
+- Required document/dependency reads succeeded. Optional previous state/handoffs/S00-028.md does not yet exist (fresh remediation); batched cat exit 1 for that path. An exploratory zsh glob state/history* also exited 1; canonical events were subsequently read from state/tasks.json successfully.
+- `codex --version`: exit 0, codex-cli 0.159.0.
+- `codex exec --help` and `codex sandbox --help`: exit 0 each. CLI warns PATH aliases could not be created on read-only filesystem; help still succeeds.
+- Python subprocess loads runner.local.json, invokes exact active argv plus --help with empty stdin and 15-second timeout; asserts exit 0, workspace-write in help, approve-for-me present, sandbox absent, empty role overrides: wrapper and child exit 0. This checks parsing only; no model or product task runs.
+- `codex -c 'sandbox_mode="workspace-write"' -c sandbox_workspace_write.network_access=true sandbox -- python3 -c '<synthetic project write/read/remove probe plus mount inspection>'`: exit 1 BEFORE the probe executes. Error: `error building bubblewrap command: app-server socket directory must be a user-owned directory with mode 0700`. Intended synthetic path: state/evidence/.S00-028-sandbox-probe. No sandbox write or mount inspection result exists; neither is claimed passed. Explicit sandbox_mode in this diagnostic selects the policy implied by approve-for-me; the active argv is unchanged.
+- Initial `git status --short --untracked-files=all`: exit 0; only coordinator claim state/tasks.json modified. No Git mutations.
+
+## Blocker
+
+Independent filesystem sandbox validation cannot run in the current host socket environment. Correcting host socket ownership/mode is outside this card's launcher arguments/documentation scope. No chmod, socket/config change, sandbox bypass, new model, storage work, or source edit attempted. Separate atomic remediation must provide a correctly owned/private socket environment and repeat the bounded no-model sandbox diagnostic. Original launcher repair remains unaccepted.