changelog: v3.0.0 baseline

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

CHANGELOG.md

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+# Changelog
+
+Notable changes to DMRlink3. This is the first tagged release; it establishes a
+baseline of the current state rather than enumerating the project's full history.
+
+## [3.0.0] — 2026-07-12
+
+First tagged release. Highlights of the current state:
+
+### Reporting & dashboard (event-driven overhaul)
+- The daemon→dashboard feed is event-driven newline-delimited JSON (the original
+  dmrlink pickle/binary-opcode protocol is not implemented). IPSC peer
+  connect/disconnect and live call events are pushed **as they happen**; the full
+  config/bridge state is resent only as a slow periodic resync + heartbeat.
+- Per-peer **ping-loss** quality metric — surfaces a peer that stays connected but
+  drops keepalives, over a sliding window (`PING_LOSS_WINDOW` / `PING_LOSS_WARN` in
+  `[GLOBAL]`); the dashboard golds the row at/above the warn threshold.
+- Canonical event vocabulary: `peer_connected` / `peer_disconnected`.
+- **Unix-socket transport** for a same-host dashboard (`REPORT_TRANSPORT=unix` +
+  `REPORT_SOCKET`; dashboard side `DMRLINK_TRANSPORT` / `DMRLINK_SOCKET`), retiring
+  the silently-severed-link failure class for local dashboards. Remote (TCP)
+  dashboards gain TCP keepalive + a feed read-timeout so a dead link is detected.
+- Modern FastAPI + WebSocket web dashboard with a live call log, per-system peer
+  tables, TRUNK endpoints, and a `?demo` mode.
+
+### Documentation
+- README and INSTALL document the Unix-socket feed and the ping-loss settings.
+
+[3.0.0]: https://github.com/n0mjs710/dmrlink3/releases/tag/v3.0.0