fix: parse MCP result payloads and drop place idempotency_key

Typed result structs replace empty envelopes. Equity place sends
ref_id only so live additionalProperties:false schemas accept the call.

market/market.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"time"
 
+	decimal "github.com/alpacahq/alpacadecimal"
 	"s1d3sw1ped/robinhood-agentic-mcp/client"
 	"s1d3sw1ped/robinhood-agentic-mcp/internal/wire"
 )
@@ -27,16 +28,34 @@ type IndexesRequest struct {
 	Symbols string // comma-separated; live schema is a string, not an array
 }
 
+// Index is one market index from get_indexes.
+type Index struct {
+	ID     string
+	Symbol string
+	Name   string
+}
+
 // IndexesResult is the parsed get_indexes payload.
-type IndexesResult struct{}
+type IndexesResult struct {
+	Indexes []Index
+}
 
 // IndexQuotesRequest is the argument set for get_index_quotes.
 type IndexQuotesRequest struct {
 	InstrumentIDs []string
 }
 
+// IndexQuote is a live index level from get_index_quotes.
+type IndexQuote struct {
+	InstrumentID string
+	Value        decimal.Decimal
+	State        string
+}
+
 // IndexQuotesResult is the parsed get_index_quotes payload.
-type IndexQuotesResult struct{}
+type IndexQuotesResult struct {
+	Quotes []IndexQuote
+}
 
 // IndexHistoricalsRequest is the argument set for get_index_historicals.
 type IndexHistoricalsRequest struct {
@@ -46,8 +65,18 @@ type IndexHistoricalsRequest struct {
 	Interval      string // required — no hidden default
 }
 
+// IndexBar is one OHLC bar from get_index_historicals.
+type IndexBar struct {
+	InstrumentID           string
+	Time                   time.Time
+	Open, High, Low, Close decimal.Decimal
+	Interpolated           bool
+}
+
 // IndexHistoricalsResult is the parsed get_index_historicals payload.
-type IndexHistoricalsResult struct{}
+type IndexHistoricalsResult struct {
+	Bars []IndexBar
+}
 
 // FinancialsRequest is the argument set for get_financials.
 type FinancialsRequest struct {
@@ -56,8 +85,20 @@ type FinancialsRequest struct {
 	Limit   int
 }
 
+// FinancialPeriod is one fiscal period from get_financials.
+type FinancialPeriod struct {
+	Symbol      string
+	Period      string
+	Revenue     decimal.Decimal
+	GrossProfit decimal.Decimal
+	NetIncome   decimal.Decimal
+	NetMargin   decimal.Decimal
+}
+
 // FinancialsResult is the parsed get_financials payload.
-type FinancialsResult struct{}
+type FinancialsResult struct {
+	Periods []FinancialPeriod
+}
 
 // EarningsResultsRequest is the argument set for get_earnings_results.
 type EarningsResultsRequest struct {
@@ -77,8 +118,16 @@ type EarningsCalendarRequest struct {
 	Filter    string
 }
 
+// EarningsEvent is one calendar row from get_earnings_calendar.
+type EarningsEvent struct {
+	Symbol     string
+	ReportDate string
+}
+
 // EarningsCalendarResult is the parsed get_earnings_calendar payload.
-type EarningsCalendarResult struct{}
+type EarningsCalendarResult struct {
+	Events []EarningsEvent
+}
 
 // SECFilingIndexRequest is the argument set for get_sec_filing_index.
 type SECFilingIndexRequest struct {
@@ -89,8 +138,18 @@ type SECFilingIndexRequest struct {
 	Cursor   string
 }
 
+// SECFilingRef is one filing from get_sec_filing_index.
+type SECFilingRef struct {
+	FilingID string
+	FormType string
+	FiledAt  string
+}
+
 // SECFilingIndexResult is the parsed get_sec_filing_index payload.
-type SECFilingIndexResult struct{}
+type SECFilingIndexResult struct {
+	Filings    []SECFilingRef
+	NextCursor string
+}
 
 // SECFilingRequest is the argument set for get_sec_filing.
 type SECFilingRequest struct {
@@ -98,8 +157,19 @@ type SECFilingRequest struct {
 	Section  string
 }
 
+// SECSection is one table-of-contents row or section body.
+type SECSection struct {
+	ID    string
+	Title string
+	Text  string
+}
+
 // SECFilingResult is the parsed get_sec_filing payload.
-type SECFilingResult struct{}
+type SECFilingResult struct {
+	FilingID string
+	Sections []SECSection
+	Text     string
+}
 
 // SECFilingFactsRequest is the argument set for get_sec_filing_facts.
 type SECFilingFactsRequest struct {
@@ -108,7 +178,15 @@ type SECFilingFactsRequest struct {
 }
 
 // SECFilingFactsResult is the parsed get_sec_filing_facts payload.
-type SECFilingFactsResult struct{}
+type SECFact struct {
+	Concept string
+	Value   string
+	Unit    string
+}
+
+type SECFilingFactsResult struct {
+	Facts []SECFact
+}
 
 // SECFilingFactsCatalogRequest is the argument set for get_sec_filing_facts_catalog.
 type SECFilingFactsCatalogRequest struct {
@@ -119,7 +197,13 @@ type SECFilingFactsCatalogRequest struct {
 }
 
 // SECFilingFactsCatalogResult is the parsed get_sec_filing_facts_catalog payload.
-type SECFilingFactsCatalogResult struct{}
+type SECConcept struct {
+	Name string
+}
+
+type SECFilingFactsCatalogResult struct {
+	Concepts []SECConcept
+}
 
 // Indexes calls get_indexes.
 func (c *Client) Indexes(ctx context.Context, req IndexesRequest) (IndexesResult, error) {