proposal: node inspect CLI debugger

XXX-node-inspect-cli-debugger.md

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+| Title  | `node inspect` CLI debugger |
+|--------|-----------------------------|
+| Author | @jkrems                     |
+| Status | DRAFT                       |
+| Date   | 2016-09-04                  |
+
+## Description
+
+For the old V8 debugger protocol,
+node offers two ways to use it:
+
+1. `node --debug <file>`: Start `file` with remote debugging enabled.
+2. `node debug <file>`: Start an interactive CLI debugger for `<file>`.
+
+But for the Chrome inspector protol,
+there's only one (`--inspect`) which is roughly equivalent to the `--debug` flag.
+It's impossible to use the new protocol without an external tool.
+
+This proposes the addition of the following commands to node:
+
+```
+node inspect script.js      # Start interactive debug session for script.js
+node inspect <host>:<port>  # Connect to inspector protocol on host:port
+```
+
+The `kill -USR2` options (`node inspect -p <pid>`) would be harder to implement.
+So while it might be very useful long-term,
+this proposal explicitly does not include this variant.
+
+The debug repl should offer the same methods & similar output to the [current debugger](https://nodejs.org/api/debugger.html).
+
+## Alternatives
+
+* Offer a blessed, stand-alone `node-inspect` module that can be installed via npm.
+* The methods & output could follow `gdb`'s example instead since it's being re-implemented anyhow.
+* The methods & output could follow `lldb`'s example instead since it's being re-implemented anyhow.