Add direct Codex CLI and goal commands

[icebear0828]

Summary

• add /codex:cli for direct Codex task execution without routing through the rescue subagent
• add /codex:goal to create, show, update, and clear persistent Codex thread goals
• enable experimental app-server capabilities for goal RPCs and make /codex:cli --resume prefer the stored goal thread

Testing

• npm test
• npm run build
• git diff --check
• real Codex CLI/app-server E2E: 3 consecutive goal create/show/clear runs with codex-cli 0.130.0

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Clear the stored goal id when that thread is cleared

When a user clears the current goal with an explicit --thread-id (the usage text allows this), the goal is removed from Codex but the plugin state still keeps goalThreadId because this branch skips storeGoalThreadId(workspaceRoot, null). Since resume resolution checks that config before task history, a later /codex:cli --resume or /codex:goal --show will keep targeting the cleared/stale goal thread instead of falling back to no goal or the latest task; clear the config when the cleared id matches the stored goal id.

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