rfq+rfqmsg: add fill quantity negotiation and constraint validation

.gitignore

@@ -28,6 +28,8 @@ cmd/tapd/tapd
 /itest/custom_channels/*.log.*
 
 /docs/examples/basic-price-oracle/basic-price-oracle
+/docs/examples/basic-portfolio-pilot/basic-portfolio-pilot
+basic-portfolio-pilot
 
 # Test binary, built with `go test -c`
 *.test

docs/examples/basic-portfolio-pilot/main.go

@@ -104,9 +104,19 @@ func (p *RpcPortfolioPilotServer) ResolveRequest(_ context.Context,
 	var hint *portfoliopilotrpc.AssetRate
 	switch r := req.GetRequest().(type) {
 	case *portfoliopilotrpc.ResolveRequestRequest_BuyRequest:
-		hint = r.BuyRequest.GetAssetRateHint()
+		br := r.BuyRequest
+		hint = br.GetAssetRateHint()
+		log.Printf("ResolveRequest buy: max=%d min=%d "+
+			"rate_limit=%v", br.GetAssetMaxAmount(),
+			br.GetAssetMinAmount(),
+			br.GetAssetRateLimit())
 	case *portfoliopilotrpc.ResolveRequestRequest_SellRequest:
-		hint = r.SellRequest.GetAssetRateHint()
+		sr := r.SellRequest
+		hint = sr.GetAssetRateHint()
+		log.Printf("ResolveRequest sell: max=%d min=%d "+
+			"rate_limit=%v", sr.GetPaymentMaxAmount(),
+			sr.GetPaymentMinAmount(),
+			sr.GetAssetRateLimit())
 	default:
 		return nil, fmt.Errorf("unknown request type: %T", r)
 	}

docs/release-notes/release-notes-0.8.0.md

@@ -103,6 +103,30 @@
   **Note:** For full functionality, it is highly recommended to start LND with
   the `--store-final-htlc-resolutions` flag enabled, which is disabled by default.
 
+- [Limit-Order Constraints](https://github.com/lightninglabs/taproot-assets/pull/2048):
+  RFQ buy and sell orders can now carry explicit limit-price bounds
+  (`asset_rate_limit`) and minimum fill sizes (`asset_min_amt` /
+  `payment_min_amt`). Quotes that violate these constraints are rejected
+  with machine-readable reasons (`RATE_BOUND_MISS`, `MIN_FILL_NOT_MET`).
+  New fields are optional and backward-compatible; constraint validation
+  only activates when they are present.
+
+- [Execution Policy](https://github.com/lightninglabs/taproot-assets/pull/2049):
+  RFQ buy and sell orders can now specify an execution policy: IOC
+  (Immediate-Or-Cancel, the default) allows partial fills above the
+  minimum, while FOK (Fill-Or-Kill) requires the full requested amount
+  or rejects the quote. FOK viability is checked in `VerifyAcceptQuote`
+  with a new `FOK_NOT_VIABLE` reject code. New fields are optional and
+  backward-compatible.
+
+- [Fill Quantity Negotiation](https://github.com/lightninglabs/taproot-assets/pull/2050):
+  RFQ accept messages now carry an optional fill quantity, allowing
+  the responder to signal the maximum amount it is willing to fill.
+  The negotiated fill caps HTLC policies so forwarding never exceeds
+  the agreed amount. `VerifyAcceptQuote` validates the fill against
+  request constraints (min fill, FOK viability). Zero fill on the
+  wire is normalised to None for backward compatibility.
+
 ## Functional Enhancements
 
 - [Wallet Backup/Restore](https://github.com/lightninglabs/taproot-assets/pull/1980):
@@ -148,6 +172,26 @@
   Add `RemoveMessage` RPC to the auth mailbox service. Receivers can
   authenticate with a Schnorr signature to delete their own messages by ID.
 
+- [PR#2048](https://github.com/lightninglabs/taproot-assets/pull/2048):
+  Add `asset_rate_limit` to `AddAssetBuyOrder` and `AddAssetSellOrder`
+  requests. Add `asset_min_amt` to buy orders and `payment_min_amt`
+  to sell orders. Add `asset_rate_limit` and min fill fields to
+  `PortfolioPilot.ResolveRequest` for constraint forwarding. Add
+  `RATE_BOUND_MISS` and `MIN_FILL_NOT_MET` to `QuoteRespStatus`.
+
+- [PR#2049](https://github.com/lightninglabs/taproot-assets/pull/2049):
+  Add `execution_policy` enum (`EXECUTION_POLICY_IOC`,
+  `EXECUTION_POLICY_FOK`) to `AddAssetBuyOrder` and `AddAssetSellOrder`
+  requests, and to `PortfolioPilot.ResolveRequest` for constraint
+  forwarding. Add `FOK_NOT_VIABLE` to `QuoteRespStatus`.
+
+- [PR#2050](https://github.com/lightninglabs/taproot-assets/pull/2050):
+  Add `max_in_asset` to `PeerAcceptedBuyQuote` and
+  `PeerAcceptedSellQuote` in both the RFQ and PortfolioPilot
+  services, exposing the negotiated fill quantity to RPC clients.
+  Add `fill_amount` to `PortfolioPilot.ResolveResponse` for
+  responder-side fill signalling.
+
 ## tapcli Additions
 
 - [Wallet Backup CLI](https://github.com/lightninglabs/taproot-assets/pull/1980):
@@ -331,6 +375,19 @@
   New integration test `testForwardingEventHistory` verifies that forwarding events are
   properly logged when routing asset payments.
 
+- [PR#2048](https://github.com/lightninglabs/taproot-assets/pull/2048):
+  Add unit, property-based, and integration tests for limit-order
+  constraint fields.
+
+- [PR#2049](https://github.com/lightninglabs/taproot-assets/pull/2049):
+  Add unit, property-based, and integration tests for execution policy.
+
+- [PR#2050](https://github.com/lightninglabs/taproot-assets/pull/2050):
+  Add unit and integration tests for fill quantity negotiation,
+  including wire roundtrip, zero-normalisation, fill-vs-constraint
+  validation, sell-side FOK/IOC with fill caps, and responder
+  constraint rejection.
+
 ## Database
 
 - [forwards table](https://github.com/lightninglabs/taproot-assets/pull/1921):
@@ -340,8 +397,18 @@
   Add `DeleteUniverseLeaf` SQL query for single-leaf deletion from a
   universe.
 
+- [PR#2050](https://github.com/lightninglabs/taproot-assets/pull/2050)
+  Add `accepted_max_amount` column to the `rfq_policies` table
+  (migration 55) to persist the negotiated fill quantity alongside
+  HTLC policies.
+
 ## Code Health
 
+- [PR#2050](https://github.com/lightninglabs/taproot-assets/pull/2050)
+  Unify buy and sell request constraint logic behind a shared
+  `RequestConstraints` interface, removing duplicated validation
+  in `VerifyAcceptQuote` and `checkRateBound`.
+
 ## Tooling and Documentation
 
 - [Wallet Backup Format Spec](https://github.com/lightninglabs/taproot-assets/pull/1980):

itest/custom_channels/custom_channels_test.go

@@ -99,6 +99,10 @@ var testCases = []*ccTestCase{
 		name: "invoice quote expiry mismatch",
 		test: testCustomChannelsInvoiceQuoteExpiryMismatch,
 	},
+	{
+		name: "limit constraints",
+		test: testCustomChannelsLimitConstraints,
+	},
 	{
 		name: "fee",
 		test: testCustomChannelsFee,