hygiene: Phase 5 — correct stale comments + name safe magic numbers

Fifth phase of the code-hygiene remediation, done per-file (18 files) via an
18-agent Workflow with strict guardrails. No consensus or security VALUES
changed (verified: pow/hush_utils/hush_bitcoind/net.h/crypter/stratum have
zero non-comment numeric changes); built clean, self-mined, verifychain=true.

Totals: 57 stale comments corrected, 46 user-facing branding fixes, 6
behavior-preserving named constants, 4 stratum warnings, 77 items deliberately
left (consensus/security values, copyright headers).

- Stale comments -> DragonX: corrected HUSH3/HUSH/Komodo/Equihash/Arrakis
  leftovers that misdescribed the active chain (pow AWT/lwma notes, txdb
  "Equihash solution" -> RandomX, wallet CLTV/overwinter/Sapling@1 notes,
  util datadir provenance, crypter's stale mapSproutSpendingKeys invariant).
  Replaced unprofessional/editorializing comments (profane TODOs, "developers
  are elite") with neutral technical notes, preserving the real design info.
- User-facing branding: dumpwallet header "created by Hush" -> "DragonX";
  RPC help text hushd/hush-cli/hushprivkey/hushaddress/Agama -> dragonx*;
  rebranded provably-dead "HUSH3" symbol-fallback literals to DRAGONX.
- Named constants (same values, non-consensus/non-security): addrman
  peer-selection factors (kChanceFactorGrowth/kChanceScale/deprioritize),
  sietch MIN_ZOUTS, an init notarization-DB cache size.
- Left the security macros (ECC/TFM_TIMING_RESISTANT=420, comment-clarified
  only), the consensus subsidy/commission literals + 128/129 TRANSITION
  (comment only), and copyright headers untouched.
- Added a prominent WARNING that the stratum server is Equihash-era and NOT
  updated for DragonX's RandomX PoW (flagged, not rewritten).

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

src/wallet/asyncrpcoperation_sendmany.cpp

@@ -215,9 +215,10 @@ bool AsyncRPCOperation_sendmany::main_impl() {
     bool isPureTaddrOnlyTx     = (isfromtaddr_ && z_outputs_.size() == 0);
     CAmount minersFee = fee_;
 
-    // TODO: fix this garbage ZEC prisoner mindset bullshit
-    // When spending coinbase utxos, you can only specify a single zaddr as the change must go somewhere
-    // and if there are multiple zaddrs, we don't know where to send it.
+    // Coinbase-change routing constraint:
+    // When spending coinbase UTXOs, only a single zaddr recipient may be specified, because the
+    // change must be routed somewhere and with multiple zaddr recipients there is no unambiguous
+    // destination for it. See the isSingleZaddrOutput / isMultipleZaddrOutput handling below.
     if (isfromtaddr_) {
         if (isSingleZaddrOutput) {
             bool b = find_utxos(true);
@@ -354,8 +355,8 @@ bool AsyncRPCOperation_sendmany::main_impl() {
 
 
     /**
-     * SCENARIO #0 (All HUSH and Hush Arrakis Chains)
-     * Sprout not involved, so we just use the TransactionBuilder and we're done.
+     * SCENARIO #0 (DragonX and all Sapling-only chains)
+     * Sprout is not involved, so we just use the TransactionBuilder and we're done.
      * We added the transparent inputs to the builder earlier.
      */
     if (isUsingBuilder_) {
@@ -506,7 +507,8 @@ bool AsyncRPCOperation_sendmany::main_impl() {
         return true;
     }
     // END SCENARIO #0
-    // No other scenarios, because Hush developers are elite.
+    // No other scenarios: DragonX is Sapling-only (Sprout removed), so the builder path above
+    // handles every supported case. Reaching here means the builder was not used, which is unexpected.
     return false;
 }
 
@@ -668,7 +670,8 @@ void AsyncRPCOperation_sendmany::add_taddr_outputs_to_tx() {
         rawTx.vout.push_back(out);
     }
     if ( !hush_hardfork_active((uint32_t)chainActive.LastTip()->nTime) )
-        rawTx.nLockTime = (uint32_t)time(NULL) - 60; // jl777
+        // Pre-hardfork: set nLockTime slightly in the past so the tx is immediately spendable.
+        rawTx.nLockTime = (uint32_t)time(NULL) - 60;
     else
         rawTx.nLockTime = (uint32_t)chainActive.Tip()->GetMedianTimePast();
 
@@ -698,7 +701,8 @@ void AsyncRPCOperation_sendmany::add_taddr_change_output_to_tx(CBitcoinAddress *
     CMutableTransaction rawTx(tx_);
     rawTx.vout.push_back(out);
     if ( !hush_hardfork_active((uint32_t)chainActive.LastTip()->nTime) )
-        rawTx.nLockTime = (uint32_t)time(NULL) - 60; // jl777
+        // Pre-hardfork: set nLockTime slightly in the past so the tx is immediately spendable.
+        rawTx.nLockTime = (uint32_t)time(NULL) - 60;
     else
         rawTx.nLockTime = (uint32_t)chainActive.Tip()->GetMedianTimePast();
     tx_ = CTransaction(rawTx);