docs(consensus): clarify extended position identity

src/xrpld/app/consensus/ConsensusExtensionsDesign.md

@@ -42,10 +42,12 @@ treated as complete and must retry or expire under transaction rules.
 
 1. Core consensus remains keyed by the transaction set.
 
-   `ExtendedPosition::operator==` intentionally compares only `txSetHash`.
-   RNG, export sig, commit-set, and entropy-set hashes are proposal sidecars.
-   They are coordinated during establish, but they do not define whether peers
-   agree on the ordinary transaction set.
+   `ExtendedPosition` has no whole-position equality or implicit `uint256`
+   conversion. Callers that need the ordinary consensus identity compare
+   `txSetHash` explicitly, or use the generic `positionTxSetID(position)` helper
+   in templated consensus code. RNG, export sig, commit-set, and entropy-set
+   hashes are proposal sidecars. They are coordinated during establish, but they
+   do not define whether peers agree on the ordinary transaction set.
 
 2. Extension waits are bounded.
 
@@ -129,7 +131,7 @@ signed proposal field remains the hash.
 This field is diagnostic only:
 
 - It is covered by the proposal signature and duplicate-suppression identity.
-- It does not participate in `ExtendedPosition::operator==`.
+- It does not participate in core tx-set identity.
 - It does not lower the active validator quorum denominator.
 - It is intended to explain timing/degraded-network cases where commits,
   reveals, or sidecar hashes arrive late or asymmetrically.
@@ -357,7 +359,7 @@ Export-only quorum behavior.
 
 When changing consensus extension code, check these questions:
 
-- Does this preserve transaction-set equality as the core consensus identity?
+- Does this preserve transaction-set identity as the core consensus identity?
 - Does every extension wait have a bounded fallback?
 - Does validator_quorum entropy require active-validator quorum alignment?
 - Can one bad validator deny entropy to an honest quorum? It must not.

src/xrpld/app/consensus/RCLCxPeerPos.h

@@ -54,12 +54,13 @@ struct ExtendedPosition
     // === Core Convergence Target ===
     uint256 txSetHash;
 
-    // === Set Hashes (sub-state quorum, not in operator==) ===
+    // === Set Hashes (sub-state quorum, not core tx-set identity) ===
     std::optional<uint256> commitSetHash;
     std::optional<uint256> entropySetHash;
     std::optional<uint256> exportSigSetHash;
     std::optional<uint256> exportSignaturesHash;
-    // Signed diagnostic only: not a quorum input and not part of operator==.
+    // Signed diagnostic only: not a quorum input and not part of tx-set
+    // identity.
     std::optional<uint256> observedParticipantsHash;
 
     // === Per-Validator Leaves (unique per proposer) ===
@@ -100,13 +101,13 @@ struct ExtendedPosition
     //     entropy result is verified deterministically from collected reveals.
     //   - Leaves (myCommitment, myReveal) are also excluded — they are
     //     per-validator data unique to each proposer.
-    //@@start rng-extended-position-equality
+    //@@start rng-extended-position-identity
     // No operator== and no implicit uint256 conversion on purpose: comparing
     // an ExtendedPosition as if it were a whole value is misleading because
     // consensus convergence intentionally ignores sidecar hashes and leaves.
     // Callers that need tx-set identity compare txSetHash explicitly, or use
     // the generic positionTxSetID(position) helper.
-    //@@end rng-extended-position-equality
+    //@@end rng-extended-position-identity
 
     // CRITICAL: Include ALL fields for signing (prevents stripping attacks)
     //
@@ -260,7 +261,7 @@ operator<<(std::ostream& os, ExtendedPosition const& pos)
 
     The resulting digest is embedded in ExtendedPosition and therefore covered
     by the normal proposal signature. The raw protobuf field remains outside
-    consensus equality, but stripping or mutating it invalidates the signed
+    core tx-set identity, but stripping or mutating it invalidates the signed
     digest before duplicate suppression.
 */
 template <class ExportSignatures>