Adds `tools/marmot-interop/dm-interop-headless.sh` — a zero-prompt
end-to-end harness that runs two independent `amy` processes against
a loopback nostr-rs-relay and verifies the NIP-17 DM surface.
Six scenarios:
dm-01 text round-trip (kind:14) in both directions
dm-02 `dm list` surfaces prior exchange with `type:text` discriminator
dm-03 strict kind:10050 refuses sends to an inboxless recipient
(surfaces the `no_dm_relays` error JSON)
dm-04 `--allow-fallback` opts into NIP-65 read / bootstrap chain
(asserts a `relay_source: "bootstrap"` or `"nip65_read"` row)
dm-05 file message reference mode (kind:15) — send-file with
--key / --nonce, verify recipient decodes url + key + nonce + mime
dm-06 no-flag `dm list` advances `state.giftWrapSince`; second call
returns an empty `messages` array
Shape matches the existing Marmot harness: reuses `lib.sh` for logging
+ result tracking, reuses `setup.sh` for the nostr-rs-relay lifecycle
(`start_local_relay` / `stop_local_relay`), adds a slim `setup-dm.sh`
preflight (amy + relay only, no whitenoise-rs / Marmot patches), and
defines tests in `tests-dm.sh`.
No new CI job yet — the relay build needs Rust + ~3 minutes on a
cold cache, same constraint as the Marmot harness.
Upload-mode (`dm send-file --file PATH --server URL`) is not scripted
here: it needs a local Blossom server, which is out of scope for this
pass. The shared upload classes are unit-tested on desktop at
`desktopApp/src/jvmTest/kotlin/.../service/upload/`.
Claude
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