Compliant rebrand: legal compliance, code audit, and documentation (Phases 0-3)

Phase 0 - Legal Compliance:
- COPYING: Add DragonX copyright, preserve all upstream attributions
- AUTHORS: Add DragonX developers section
- LICENSE: Restore standard FSF GPLv3 text (fix GNU→GENERAL error)
- Add DragonX copyright headers to all 21 modified source files
- contrib/debian/copyright: Add DragonX attribution
- README.md: Add GPLv3 Section 5(a) attribution section

Phase 1 - init.cpp Cleanup:
- PID file: hushd.pid → dragonxd.pid
- Shutdown thread: hush-shutoff → dragonx-shutoff
- Debug message: stopping HUSH → stopping DragonX

Phase 2 - HUSH3/ishush3 Code Audit:
- Rename ishush3 → isdragonx across ~15 source files
- Update "HUSH3" chain-identity checks to "DRAGONX" in consensus,
  difficulty, notarization, devtax, and RPC code
- Intentionally preserve cross-chain "HUSH3" refs (gateway, notary dest)
- Build verified: all three binaries compile cleanly

Phase 3 - Documentation:
- README.md: Full rewrite with DragonX chain params, build instructions
- Man pages: Create dragonxd.1, dragonx-cli.1, dragonx-tx.1 (v1.0.0)
- Doc files: Add beefy-DRAGONX.conf, dragonxd-systemd.md, dragonxd.service
- Init scripts: Create dragonxd.{conf,init,openrc,openrcconf,service}
- Debian packaging: Update control, changelog, install, manpages, examples
- Update doc/init.md and contrib/init/README.md

doc/man/dragonx-tx.1

@@ -0,0 +1,105 @@
+.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.49.3.
+.TH DRAGONX-TX "1" "March 2026" "dragonx-tx v1.0.0" "User Commands"
+.SH NAME
+dragonx-tx \- manual page for dragonx-tx v1.0.0
+.SH DESCRIPTION
+DragonX TX utility version v1.0.0\-04916cdf5
+.SS "Usage:"
+.TP
+dragonx\-tx [options] <hex\-tx> [commands]
+Update hex\-encoded DragonX transaction
+.TP
+dragonx\-tx [options] \fB\-create\fR [commands]
+Create hex\-encoded DragonX transaction
+.SH OPTIONS
+.HP
+\-?
+.IP
+This help message
+.HP
+\fB\-create\fR
+.IP
+Create new, empty TX.
+.HP
+\fB\-json\fR
+.IP
+Select JSON output
+.HP
+\fB\-txid\fR
+.IP
+Output only the hex\-encoded transaction id of the resultant transaction.
+.HP
+\fB\-regtest\fR
+.IP
+Enter regression test mode, which uses a special chain in which blocks
+can be solved instantly.
+.HP
+\fB\-testnet\fR
+.IP
+Use the test network
+.PP
+Commands:
+.IP
+delin=N
+.IP
+Delete input N from TX
+.IP
+delout=N
+.IP
+Delete output N from TX
+.IP
+in=TXID:VOUT(:SEQUENCE_NUMBER)
+.IP
+Add input to TX
+.IP
+locktime=N
+.IP
+Set TX lock time to N
+.IP
+nversion=N
+.IP
+Set TX version to N
+.IP
+outaddr=VALUE:ADDRESS
+.IP
+Add address\-based output to TX
+.IP
+outscript=VALUE:SCRIPT
+.IP
+Add raw script output to TX
+.IP
+sign=HEIGHT:SIGHASH\-FLAGS
+.IP
+Add zero or more signatures to transaction. This command requires JSON
+registers:prevtxs=JSON object, privatekeys=JSON object. See
+signrawtransaction docs for format of sighash flags, JSON
+objects.
+.PP
+Register Commands:
+.IP
+load=NAME:FILENAME
+.IP
+Load JSON file FILENAME into register NAME
+.IP
+set=NAME:JSON\-STRING
+.IP
+Set register NAME to given JSON\-STRING
+.SH COPYRIGHT
+
+In order to ensure you are adequately protecting your privacy when using DragonX,
+please see <https://dragonx.is>.
+
+Copyright (C) 2024-2026 The DragonX Developers
+
+Copyright (C) 2016-2026 Duke Leto and The Hush Developers
+
+Copyright (C) 2016-2020 jl777 and SuperNET developers
+
+Copyright (C) 2016-2018 The Zcash developers
+
+Copyright (C) 2009-2014 The Bitcoin Core developers
+
+This is experimental Free Software! Fuck Yeah!!!!!
+
+Distributed under the GPLv3 software license, see the accompanying file COPYING
+or <https://www.gnu.org/licenses/gpl-3.0.en.html>.