docs: rebrand documentation, packaging, and helper scripts to DragonX

The docs/packaging were largely un-rebranded Hush3 content, with several
docs stating facts that are wrong for DragonX. This rewrites them against
the verified DragonX source state.

Corrections (not just branding):
- PoW: RandomX (CPU), not Equihash/ASIC — README, overview.md, randomx.md
- Privacy: private from genesis (ac_private=1, Sapling@height1), not "as of
  block 340000" — overview.md, payment-api.md
- Removed the false "coinbase must be shielded" consensus claim
  (shield-coinbase.md, payment-api.md); coinbase is directly spendable
- Fixed default fee 0.0001 (was 0.0010000, 10x); stratum port 22769 (was 19031)
- datadir ~/.hush/DRAGONX, DRAGONX.conf, dragonxd/dragonx-cli/dragonx-tx,
  git.dragonx.is throughout; branch model dev->dragonx
- Softened the inherited dPoW reorg claim (no live DragonX notary infra)

Packaging: fix build-debian-package.sh + gen-manpages.sh to use the dragonx
binaries/manpages; rename bash-completions to dragonx*; drop hush-arrakis-chain
from the package. Keep /usr/share/hush (hardcoded in the binary for params).

Also: README links/logo, ObsidianDragon + SilentDragonXAndroid wallets,
networking/init/dev-process/contrib/util rebrand, and leftover helper scripts.
Delete legacy duplicates (hushd.* init/service, HUSH3.conf examples,
OLD_WALLETS.md, hsc.md) and rename hush-uri.bat -> dragonx-uri.bat.

Out of scope (noted, not changed): historical changelog/copyright, the Hush
mainnet airdrop snapshot, seed data files, depends/ source mirrors, and the
in-code strCurrencyUnits="HUSH".

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

util/README.md

@@ -1,52 +1,64 @@
-# Hush utilities
+# DragonX utilities
 
-Scripts in this directory are used by Hush developers in the process of development
-or in releasing a new version of Hush.
+Scripts in this directory are used by DragonX developers in the process of development
+or in releasing a new version of DragonX.
 
 Utilities in this directory:
 
 ## build.sh
 
-Compile Hush full node code.
+Compile DragonX full node code. This is the main build entrypoint.
 
 ## build-arm.sh
 
-Compile Hush full node code for ARM architecture.
+Compile DragonX full node code for ARM architecture.
 **has not worked for some time**
 
 ## build-arm-xcompile.sh
 
-Cross-Compile Hush full node code for ARM architecture on an x86 build server.
+Cross-Compile DragonX full node code for ARM architecture on an x86 build server.
 
 ## build-debian-package.sh
 
-Builds an x86 Debain package for Hush.
+Builds an x86 Debian package for DragonX.
 
 ## build-debian-package-ARM.sh
 
-Builds an ARM Debain package for Hush.
+Builds an ARM Debian package for DragonX.
 
 ## build-mac.sh
 
-Compile Hush full node code for mac. NOTE: This is likely broken.
+Compile DragonX full node code for mac. NOTE: This is likely broken.
 
 ## build-win.sh
 
-Compile Hush full node code for windows
+Compile DragonX full node code for windows
+
+## bootstrap-dragonx.sh
+
+Download and apply a DRAGONX blockchain bootstrap so a new node can sync quickly.
+Safely preserves wallet.dat and configuration files, and verifies the archive against
+checksums and (once configured) a detached signature. See sign-bootstrap.md for the
+signing procedure.
+
+## sign-bootstrap.md
+
+Documentation for maintainers on how to create the signing keypair and sign the
+DRAGONX.zip bootstrap archive that bootstrap-dragonx.sh verifies.
 
 ## checkpoints.pl
 
 Generate checkpoint data for chainparams.cpp . This automates the creation of
-block heights and block hashes by asking hushd for the data and then generating
-the C++ code needed to embed them in the Hush source code.
+block heights and block hashes by asking dragonxd (via dragonx-cli) for the data
+and then generating the C++ code needed to embed them in the DragonX source code.
 
 ## docker-entrypoint.sh
 
-Script to use Hush with Docker.
+Script to use DragonX with Docker.
 
 ## docker-hush-cli.sh
 
-Convenience script to run hush-cli in a running Docker container.
+Convenience script to run dragonx-cli in a running Docker container.
 
 ## replace.pl