feat: implement the REPL integration

[shadowusr]

What's done?

Implemented the REPL integration. The idea is that REPL can be yet another "backend"/"transport" for communicating with browser, so the BrowserAdapter was introduced, which will let us use other backends in the future, namely connect to CDP endpoints.

Currently, this integration lets agents perform two crucial actions:

• run code
• take snapshot

Other commands will return an error similar to Tool 'navigate' is not yet supported with REPL sessions. Currently supported in REPL mode: snapshot, run-code.

Which together means that agents can execute & debug tests line-by-line.

API is attach-to-repl, then other tools automatically begin using the repl connection. Command help output:

Usage: testplane-cli attach-repl [options]

Attach to a running Testplane REPL session

Options:
  --port <value>  Testplane REPL TCP port
  --host <value>  Testplane REPL TCP host (default: "127.0.0.1")
  -h, --help      display help for command

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Gate MCP actions by REPL transport

When an MCP client opens a session with attach-repl, browser becomes a ReplBrowser, but this path still invokes every action tool regardless of its new supportedTransports value. Tools such as click and navigate are marked launch-browser only and call Webdriver-specific methods that ReplBrowser does not implement, so MCP users can hit runtime failures after attaching to a REPL; the daemon path added a transport check, but the MCP server needs the same guard or transport tracking.

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