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-cli.1

@@ -0,0 +1,91 @@
+.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.49.3.
+.TH DRAGONX-CLI "1" "March 2026" "dragonx-cli v1.0.0" "User Commands"
+.SH NAME
+dragonx-cli \- manual page for dragonx-cli v1.0.0
+.SH DESCRIPTION
+DragonX RPC client version v1.0.0\-04916cdf5
+.PP
+In order to ensure you are adequately protecting your privacy when using DragonX,
+please see <https://dragonx.is>.
+.SS "Usage:"
+.TP
+dragonx\-cli [options] <command> [params]
+Send command to DragonX
+.TP
+dragonx\-cli [options] help
+List commands
+.TP
+dragonx\-cli [options] help <command>
+Get help for a command
+.SH OPTIONS
+.HP
+\-?
+.IP
+This help message
+.HP
+\fB\-conf=\fR<file>
+.IP
+Specify configuration file (default: DRAGONX.conf)
+.HP
+\fB\-datadir=\fR<dir>
+.IP
+Specify data directory (this path cannot use '~')
+.HP
+\fB\-testnet\fR
+.IP
+Use the test network
+.HP
+\fB\-regtest\fR
+.IP
+Enter regression test mode, which uses a special chain in which blocks
+can be solved instantly. This is intended for regression testing
+tools and app development.
+.HP
+\fB\-rpcconnect=\fR<ip>
+.IP
+Send commands to node running on <ip> (default: 127.0.0.1)
+.HP
+\fB\-rpcport=\fR<port>
+.IP
+Connect to JSON\-RPC on <port> (default: 18030 )
+.HP
+\fB\-rpcwait\fR
+.IP
+Wait for RPC server to start
+.HP
+\fB\-rpcuser=\fR<user>
+.IP
+Username for JSON\-RPC connections
+.HP
+\fB\-rpcpassword=\fR<pw>
+.IP
+Password for JSON\-RPC connections
+.HP
+\fB\-rpcclienttimeout=\fR<n>
+.IP
+Timeout in seconds during HTTP requests, or 0 for no timeout. (default:
+900)
+.HP
+\fB\-stdin\fR
+.IP
+Read extra arguments from standard input, one per line until EOF/Ctrl\-D
+(recommended for sensitive information such as passphrases)
+.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>.