Own CLI dispatch transport in wp-coding-agents

[chubes4]

Summary

• Add a wp-coding-agents-owned CLI transport mu-plugin for agents/dispatch-message, synced by setup and upgrade.
• Publish bridge channel config through wp_coding_agents_cli_channels while preserving legacy datamachine_code_cli_channels compatibility for existing installs.
• Update bridge/docs ownership language and add CI coverage for transport install, runtime dispatch, and channel registry permissions.

Closes #177.

Verification

• git diff --check
• php tests/smoke-cli-transport.php
• ./tests/cli-transport-install.sh
• ./tests/cli-channel-perms.sh
• ./tests/bridge-render.sh
• ./tests/opencode-wrapper-removal.sh
• ./tests/kimaki-agent-fallback.sh

DMC follow-up

Data Machine Code should follow with a coordinated cleanup PR that stops registering/removes its generic CliChannelTransport/CliChannelRegistry runtime, leaving any DMC-specific channel contributions only if they exist. This wp-coding-agents PR keeps reading datamachine_code_cli_channels so that cleanup can happen after deployment without breaking existing bridge registrations.

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (openai/gpt-5.5)
• Used for: Drafted and implemented the CLI transport migration, compatibility tests, docs, and PR body; Chris remains responsible for review and merge.