feat(.5231): router on/off toggle in SCXChat

[Sir-J-AU]

What

Adds a visual Router on/off toggle to the SCXChat status strip, plus the effective-base plumbing behind it. Per HR29 (additive layers): with the router OFF (default) requests go DIRECT to SCX and always work; ON routes via the local LiteLLM router at http://127.0.0.1:4180.

Changes

Setting — kritical.scxcode.routerEnabled (boolean, default false) in src/package.json.

Toggle UI (chatHtml) — a glass/navy-cyan Router pill in the status strip:

• Three visual states: off (muted), on (cyan-lit, knob slides right), direct (amber — enabled but router unreachable → running direct).
• Tooltip explains ON = route via 127.0.0.1:4180, OFF = direct to SCX (HR29 baseline, always works).
• Click + keyboard (Enter/Space) toggle; posts setConfig routerEnabled then re-requests config so the host re-probes and corrects the pill live.
• Rendered in both the panel and the sidebar (shared chatHtml).

Host — effective base logic:

• resolveEffectiveBase() computes the base URL per request — router when enabled and reachable, else the configured direct baseUrl. Never overwrites the operator's baseUrl setting.
• Router enabled but unreachable → transparent fallback to direct + a subtle status hint (no hard-fail).
• probeRouterUrl() health-checks /health/liveliness with a short timeout.
• requestJson() picks http vs https by URL protocol and honours the port, so the plain-http localhost router works; scxPost and fetchLiveModels both route through it identically.
• HR1 intact — SCX_API_KEY only.
• Status strip dot/text reflect the effective base + router state (↺ router / ↺ router unreachable → direct).

Verify

• cd src && npm run build → esbuild green (212.9kb).
• node codex-wrapper/scx-agentic-shim.test.mjs → 6/6 pass.
• Standalone tsc --noEmit on extension.ts → clean.
• Router markup + handlers confirmed present in the built bundle.

Does not touch codex-wrapper/pack/.

🤖 Generated with Claude Code

[Sir-J-AU]

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📥 Commits

Reviewing files that changed from the base of the PR and between e47d018 and 97affa1.

📒 Files selected for processing (2)

• src/extension.ts
• src/package.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/router-toggle

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