istrain-public: from-scratch build of a passive RF train detector

Public community release. The complete working system — DSP + decoders (scripts/),
web dashboard + API (dashboard/), container stack (docker/), config templates (config/) —
plus APOCALYPSE-EDITION.md, the full build guide for a human or a coding agent. GPLv3
(PyEOT dependency). Scrubbed of all secrets, internal IPs, hostnames, and location detail.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ATTRIBUTION.md

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+# Attribution & licensing
+
+**istrain-public is licensed GPLv3** (see [`LICENSE`](LICENSE)). This choice follows the
+strongest dependency: the EOT decoder validates frames against **PyEOT**, which is GPLv3.
+
+## Third-party code vendored here
+
+- **`scripts/eot/PyEOT/`** — [PyEOT by Eric Reuter](https://github.com/ereuter/PyEOT), the
+  open-source End-of-Train / FFSK decoder (packet parser + BCH check) and its demo recording.
+  **GPLv3**, its `LICENSE` kept intact in that directory. Our `scripts/eot/eot_scan.py` calls
+  into it at runtime for frame-sync and validity checking; the two-pass adaptive front-end
+  (drift-tolerant tone tracking + fuzzy sync) is our addition.
+
+## The shoulders this stands on
+
+The tools and communities credited in the dashboard's **With Thanks** panel are the real
+foundation — RTL-SDR Blog and the osmocom rtl-sdr tools, RTLSDR-Airband, faster-whisper /
+OpenAI Whisper, FFmpeg, NumPy, Docker + Dockge, and the railfan frequency communities
+(RadioReference, Railroad-Frequencies.com, the regional railfan sites) that publish the
+channel plans that make any of this findable. See `dashboard/index.html` for the full list
+with links.
+
+## Note for the person who forked this
+
+If you'd rather license your own build permissively (MIT/BSD), you can — **but not while
+PyEOT is vendored and imported.** Swap in your own FFSK frame parser + BCH check (the spec is
+public — 1200-baud FFSK, the SigidWiki EOTD page documents it), drop `scripts/eot/PyEOT/`, and
+the GPL obligation goes with it. Everything else here is original work.