#10665: fix(docs): replace removed gateway wake with system event in coding-agent skill

## Summary - The coding-agent skill references `openclaw gateway wake --text "..." --mode now`, but this command was removed during the CLI refactor and fails with `error: unknown option '--text'` - Replaced with `openclaw system event --text "..." --mode now` (defined in `src/cli/system-cli.ts`) - Added a note clarifying that `--mode now` delivers the event to the gateway immediately, but the agent processes it on its next turn (heartbeat or incoming message), not synchronously — based on @semidark-kiki's feedback in #10144 This is a resubmission of #10162 (closed by bot) rebased on latest main, with the delivery semantics clarification included from the start. ## Test plan - [x] Verified `openclaw system event` command exists in `src/cli/system-cli.ts` with `--text` and `--mode` options - [x] No other references to the old `gateway wake` command remain in the codebase - [x] Documentation-only change, no functional code modified Closes #10144 🤖 Generated with [Claude Code](https://claude.com/claude-code) <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> - Updates the `coding-agent` skill docs to use `openclaw system event --text ... --mode now` instead of the removed `openclaw gateway wake --text ... --mode now`. - Adds a clarification that `--mode now` delivers immediately to the gateway, but the agent only processes the event on its next turn (heartbeat/incoming message). - Adjusts the embedded Codex example prompt accordingly; no runtime code paths are changed. <h3>Confidence Score: 5/5</h3> - This PR is safe to merge with minimal risk. - Changes are limited to documentation and correctly align the skill instructions with the existing `openclaw system event` CLI (including `--text` and `--mode now`). No functional code was modified and no new failure modes were introduced. - No files require special attention <!-- greptile_other_comments_section --> <!-- /greptile_comment -->