Replaces LICENSE (GPLv3 -> AGPLv3) and prepends
`SPDX-License-Identifier: AGPL-3.0-or-later` to every source file
across decnet/, decnet_web/, tests/, scripts/, and tools/.
Rationale: closes the GPLv3 ASP loophole so any party operating a
modified DECNET as a network service must offer their modified
source. Personal copyright (Samuel Paschuan) + inbound=outbound
contributions make a future unilateral relicense infeasible.
- LICENSE: full AGPL-3.0 text (gnu.org/licenses/agpl-3.0.txt)
- COPYRIGHT: project copyright notice
- tools/add_spdx_headers.py: idempotent header injector
(shebang- and PEP 263-aware)
Touches 1565 source files (.py, .ts, .tsx, .js, .jsx, .css, .sh).
No behavior change; comments only.
Ships the backend half of Config → Workers:
* Worker registry aggregates `system.*.health` + `system.bus.health`
heartbeats into a last-seen dict; OK / STALE / UNKNOWN tiers drop
out of a 90s window (3× the 30s heartbeat interval).
* `GET /api/v1/workers` returns the snapshot plus `bus_connected`
(so the UI can explain "all UNKNOWN" when the bus socket is down)
and a per-row `installed` flag populated from
`systemctl list-unit-files decnet-*.service` (cached 30s).
* `POST /api/v1/workers/{name}/stop` publishes a stop intent on
`system.<name>.control`; workers listen via the shared control
listener in `bus/publish.py`.
* Heartbeat + control listener wired into collector / profiler /
sniffer / prober / mutator worker loops. API self-heartbeats too
so the panel always has one ground-truth row.
* Topic helper `system_control(name)` + tests covering builder
validation, control listener shutdown path, and the API surface
(auth gating, bus-connected field, unknown-name 404).
Adds `StartFailure` / `StartAllResponse` models in anticipation of
the upcoming start endpoints (DEBT-034).
