fix(opencode): refresh stale kimaki wrapper

[chubes4]

Summary

• Run the OpenCode wrapper refresh path for CHAT_BRIDGE=kimaki installs even when the primary runtime is no longer OpenCode.
• Replace stale bash wrappers when their content does not match the current canonical wrapper, backing up the old file first.
• Add an opencode-wrapper regression test and wire it into CI.

Fixes #106.

Testing

• ./tests/opencode-wrapper.sh
• ./tests/bridge-render.sh
• node tests/effective-prompt/run.mjs
• homeboy lint wp-coding-agents --path /Users/chubes/Developer/wp-coding-agents@fix-opencode-wrapper-refresh
• PATH=\"$HOME/.nvm/versions/node/v24.13.1/bin:$PATH\" ./upgrade.sh --dry-run --wp-path /Users/chubes/Studio/intelligence-chubes4 --runtime claude-code --skip-plugins

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Drafted the wrapper refresh fix, regression test, and local verification; Chris remains responsible for review and merge.