[connorjfarrell]

Adds Retention 0.1.0: it deletes the oldest calls from the recordings folder once they are older than a set age, the folder is bigger than a set size, or it is more than a set share of its disk. It replaces the built-in retention I proposed in TrunkRecorder/trunk-recorder-pro#26, as a plugin instead of core code.

• What it touches: only a call's own files (.wav, .m4a, .json, .frames.jsonl, .sdr) under the recordings folder the recorder gives it, all of a call's files together, oldest first. A call changed in the last ten minutes is never deleted. It refuses a root or missing folder and doesn't follow links. It sends no data anywhere.
• Safe to try: a Dry run setting reports what it would delete without deleting. With no limit set, it deletes nothing and says so.
• Subscribes to call.concluded only to run a pass early on a busy recorder.
• Checked: ./check plugins/retention.json passes; the release workflow built all four platforms with attestations. 16 tests, clippy -D warnings and fmt are clean. I have run it on a live recorder with a real recordings folder, including a dry run over about 208,000 calls.

(Supersedes #13, which I closed after rewriting the release's commit history.)

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