docs(search): don't threshold JSON score as Tavily

S1: skill recipe now says result score is merged rank. Also send
non-zero --min-score to the server (N1), sort include_domains (N2),
and note that search_queries counts each sub-query (N3).

README.md

@@ -45,7 +45,8 @@ sift extract <file.pdf> [--pages a-b] [--grep re] [--question q] [--mode clean|d
 the key file must be mode 0600. `sift extract` uploads a local PDF to `/v1/extract` and prints the
 answer exactly as `sift fetch` does for a PDF URL — `--pages`, `--grep` and `--question` behave the
 same, and a file over 100 MiB is refused before the upload. The agent-facing guide is
-[`skill/SKILL.md`](skill/SKILL.md).
+[`skill/SKILL.md`](skill/SKILL.md). JSON `search_queries` (and `sift_search_queries_*`) counts
+each sub-query as its own upstream call, so a 4-query search is 4× one `query`.
 
 ## Batch
 

cmd/sift/searchcmd.go

@@ -96,7 +96,7 @@ func searchMain() {
 	if *exact {
 		body["exact_match"] = true
 	}
-	if *minScore > 0 {
+	if *minScore != 0 {
 		body["min_score"] = *minScore
 	}
 	base, key, err := loadClient()

internal/search/filter.go

@@ -1,6 +1,7 @@
 package search
 
 import (
+	"sort"
 	"strings"
 	"time"
 	"unicode/utf8"
@@ -170,6 +171,7 @@ func normalizeDomains(in []string, hint string) ([]string, string) {
 	if len(out) == 0 {
 		return nil, ""
 	}
+	sort.Strings(out)
 	if len(out) > maxDomainList {
 		return nil, hint
 	}

internal/search/p31_test.go

@@ -150,6 +150,18 @@ func TestNormalizeDomainOR(t *testing.T) {
 	if msg != "" || hint != "" || len(out.IncludeDomains) != 1 || out.IncludeDomains[0] != "oracle.com" {
 		t.Fatalf("%q %q %+v", msg, hint, out)
 	}
+	_, out, msg, _ = NormalizeSearch("q", nil, Filter{IncludeDomains: []string{"z.com", "a.com", "m.com"}})
+	if msg != "" || strings.Join(out.IncludeDomains, ",") != "a.com,m.com,z.com" {
+		t.Fatalf("sorted domains %+v", out.IncludeDomains)
+	}
+	_, four, _, _ := NormalizeSearch("q", nil, Filter{IncludeDomains: []string{"d.com", "c.com", "b.com", "a.com"}})
+	q, notes := searxQueryAndNotes("q", four)
+	if !strings.HasPrefix(q, "site:a.com OR site:b.com OR site:c.com ") {
+		t.Fatalf("site subset %q", q)
+	}
+	if !strings.Contains(strings.Join(notes, " "), "extra include_domains dropped") {
+		t.Fatalf("notes %v", notes)
+	}
 }
 
 func TestMultiQueryRRF(t *testing.T) {

skill/SKILL.md

@@ -80,8 +80,9 @@ sift search "product launch" --include-domain openai.com --topic news --time-ran
 
 **Recipe:** after `sift search --json`, do not `sift fetch` every URL. Drop hits below a
 Tavily score you care about (`--min-score`, Tavily's 0–1 scale) or take top N, then
-`sift batch submit`. `web_search` is only the fallback when sift is unreachable, and it
-still hits `/v2/search` with no filters.
+`sift batch submit`. The `score` field is sift's merged rank, not comparable across
+sources: use `--min-score` for Tavily's threshold, or take the top N. `web_search` is
+only the fallback when sift is unreachable, and it still hits `/v2/search` with no filters.
 
 ## Batch