[codex] add QoderWork CN bridge tweak

[jupiternaut]

Summary

Adds a bundled Codex++ tweak for QoderWork CN that exposes a local OpenAI Responses-compatible bridge model (qoderworkcn-codex) backed by the QoderWork CN CLI qmodel lane.

What changed

• Add tweaks/qoderworkcn-bridge with main-process bridge startup and renderer settings UI.
• Add a local Responses API server with /v1/responses, /v1/models, /health, /usage, and /codexbar/cost.
• Add structured tool-call bridging for Codex app tools and explicit Subagent A/B/... startup planning via create_thread.
• Add CodexBar-style JSONL usage ledger and a settings-page usage visualization.
• Add isolated profile/config handling so the tweak can avoid mutating the user's normal ~/.codex profile.
• Add docs and focused Node tests.

Installation / usage note

Installing Codex++ alone does not automatically switch Codex to QoderWork. The bridge works when this bundled tweak is linked/enabled, for example with:

codexplusplus dev tweaks/qoderworkcn-bridge --replace --no-watch

The machine must also have QoderWork CN CLI available at the configured QODER_CLI path. The tweak then starts a local Responses-compatible endpoint and writes managed Codex provider config into its isolated profile unless QODERWORKCN_CODEX_HOME or CODEX_HOME is set explicitly.

Validation

• node --import tsx packages/installer/src/cli.ts validate-tweak tweaks/qoderworkcn-bridge
• npm test --prefix tweaks/qoderworkcn-bridge
• npm test --prefix tweaks/qoderworkcn-bridge/bridge
• staged diff scan for local usernames, API keys, and usage JSONL files

Recreated from closed upstream PR: b-nnett#606