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.
Covers failure modes the happy-path tests miss:
- log rotation (copytruncate): st_size shrinks under the forwarder, it
resets offset=0 and reships the new contents instead of getting wedged
past EOF;
- listener restart: forwarder retries, resumes from the persisted offset,
and the previously-acked lines are NOT duplicated on the master;
- listener tolerates a well-authenticated client that sends a partial
octet-count frame and drops — the server must stay up and accept
follow-on connections;
- peer_cn / fingerprint_from_ssl degrade to 'unknown' / None when no
peer cert is available (defensive path that otherwise rarely fires).
