Chromium plugin: tab selection by URL/title

[asklar]

Summary

The Chromium plugin only inspects the active tab (docs/chromium-plugin.md → Limitations / Future work). Allow selecting a specific tab by URL or title pattern.

Scope

• Enumerate targets via CDP Target.getTargets and select the page whose URL/title matches a pattern (e.g. --chromium-tab <pattern>, or reuse --title semantics).
• Attach to the chosen page target for the DOM walk.
• Update docs/chromium-plugin.md.

Acceptance criteria

• Can target a non-active tab by URL or title substring.
• Clear error when no tab matches.
• Tests for the target-selection logic.

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Filed as part of turning README/docs "Future work" into tracked issues. See docs/architecture.md and CONTRIBUTING.md (""Adding a new provider"") for conventions.

[asklar]

Implemented and merged in #22 (Chromium plugin: select tab by URL/title). Closing as completed (PR lacked a closing keyword).