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/pow.cpp

@@ -414,7 +414,10 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
 
 // Changing this requires changing many other things and
 // might change consensus. Have fun -- Duke
-// NOTE: Ony HUSH3 mainnet should use this function, all HAC's should use params.AveragigWindowTimespan()
+// NOTE: This hardcoded AWT is legacy from the original HUSH3 mainnet. On DragonX the
+// CalculateNextWorkRequired strncmp(SMART_CHAIN_SYMBOL,"HUSH3",...) check is never true
+// (SMART_CHAIN_SYMBOL is "DRAGONX"), so this function is dead here and the params-derived
+// AveragingWindowTimespan() is used instead. Kept as-is to avoid a consensus change.
 int64_t AveragingWindowTimespan() {
     // used in const methods, beware!
     // This is the correct AWT for 75s blocktime, before block 340k
@@ -432,8 +435,11 @@ unsigned int CalculateNextWorkRequired(arith_uint256 bnAvg,
     int64_t nActualTimespan = nLastBlockTime - nFirstBlockTime;
     LogPrint("pow", "  nActualTimespan = %d  before dampening\n", nActualTimespan);
 
+    // Legacy branch: the original HUSH3 mainnet used the hardcoded AveragingWindowTimespan()
+    // above; every other chain uses the params-derived value. On DragonX the symbol is
+    // "DRAGONX", so this comparison is always false and the params value is used. The check is
+    // kept (rather than removed) because it is part of consensus difficulty calculation.
     bool ishush3 = strncmp(SMART_CHAIN_SYMBOL, "HUSH3",5) == 0 ? true : false;
-    // If this is HUSH3, use AWT function defined above, else use the one in params
     int64_t AWT = ishush3 ? AveragingWindowTimespan() : params.AveragingWindowTimespan();
 
     nActualTimespan = AWT + (nActualTimespan - AWT)/4;
@@ -481,8 +487,9 @@ unsigned int CalculateNextWorkRequired(arith_uint256 bnAvg,
     return bnNew.GetCompact();
 }
 
-// HUSH does not use these functions but Hush Arrakis Chains can opt-in to using more bleeding edge DAA's
-// ASIC chains do not need these protections as much -- Duke Leto
+// These LWMA difficulty functions are inherited from the Hush lineage and are only used when
+// ASSETCHAINS_ALGO is neither Equihash nor RandomX (see the dispatch in GetNextWorkRequired).
+// DragonX uses RandomX, so this LWMA path is not on DragonX's active difficulty codepath.
 unsigned int lwmaGetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params& params)
 {
     return lwmaCalculateNextWorkRequired(pindexLast, params);