fix(runtime): honor OPENCLI_CDP_ENDPOINT for non-Electron browser commands

[KhanCold]

Description

Honor OPENCLI_CDP_ENDPOINT for non-Electron browser commands that were still forcing Browser Bridge.

Previously, OPENCLI_CDP_ENDPOINT was only respected for Electron apps (e.g., Cursor, Codex). Non-Electron browser commands (e.g., opencli youtube, opencli hackernews) always used BrowserBridge, which requires the Chrome extension and fails in headless environments without a GUI.

This PR fixes the routing logic so that when OPENCLI_CDP_ENDPOINT is set, all browser-backed commands route through CDPBridge, enabling headless/remote server usage.

Related issue: #867

Type of Change

• 🐛 Bug fix

Checklist

• I ran the checks relevant to this PR
• I updated tests or docs if needed
• I included output or screenshots when useful

Changes

src/runtime.ts

• getBrowserFactory() now accepts an optional cdpEndpoint parameter
• Returns CDPBridge when cdpEndpoint is provided or OPENCLI_CDP_ENDPOINT env var is set
• Falls back to existing behavior (Electron check → BrowserBridge) when neither is present

src/execution.ts

• Non-Electron browser commands now read OPENCLI_CDP_ENDPOINT and pass it to getBrowserFactory()
• Electron app logic unchanged (still probes endpoint and auto-detects)

src/runtime.test.ts (new)

• Tests for getBrowserFactory() with cdpEndpoint argument
• Tests for getBrowserFactory() with OPENCLI_CDP_ENDPOINT env var
• Tests for Electron app routing (unchanged behavior)
• Tests for default BrowserBridge routing
• Tests for whitespace-only env var being ignored

Test Results

$ npx vitest run src/runtime.test.ts
 ✓  unit  src/runtime.test.ts (8 tests) 22ms

$ npx vitest run src/execution.test.ts
 ✓  unit  src/execution.test.ts (22 tests) 113ms

$ npx vitest run src/browser/cdp.test.ts
 ✓  unit  src/browser/cdp.test.ts (2 tests) 8ms

$ npx vitest run src/cli.test.ts
 ✓  unit  src/cli.test.ts (159 tests) 530ms

$ npm run build
✅ Manifest compiled: 815 entries

Screenshots / Output

Before (with OPENCLI_CDP_ENDPOINT set):

$ opencli browser test open https://example.com
# Hangs for 60s then times out — BrowserBridge tries to load extension

After (with OPENCLI_CDP_ENDPOINT set):

$ export OPENCLI_CDP_ENDPOINT="http://127.0.0.1:9222"
$ opencli browser test open https://example.com
# Uses CDPBridge, connects directly to Chrome via CDP

Backward Compatibility

• No breaking changes
• Without OPENCLI_CDP_ENDPOINT, behavior is identical to before
• Electron app auto-launch logic is untouched