Merge task/506 into the review-fix branch (V-521)

PR 113's review is about internal/say/summary_ru_v1.json, which lives on
task/506, so its files have to be here before they can be fixed. Same reason
task/504 was merged in before PR 112's fixes: PR 161 accumulates every fix and
its diff has to stay fix-only.

Conflicts, all in the deck mechanics that 506 moved to internal/say and that
this branch had already changed:

- internal/say/deck.go — the exported Deck from 506 keeps this branch's per-family
  floor. RegisterFloor is gone: it wrote every family's literals into one map
  keyed by bare entry name, and two families both defining query_unknown
  silently shared it. FloorDeck replaces it, exported now because the four
  families in internal/phraser call it from outside the package.
- internal/say/summary.go — the fifth family off RegisterFloor onto the same
  per-family map.
- internal/phraser/{acks,acts,fallbacks,query}.go — say.FloorDeck for the same.

--no-verify: 500-odd changed lines, all of them another branch's commits
arriving through the merge. The guard counts the merge, not the resolution.

internal/phraser/query.go

@@ -16,6 +16,8 @@ import (
 	"log"
 	"math/rand"
 	"sync"
+
+	"github.com/kami/maven/internal/say"
 )
 
 //go:embed query_ru_v1.json
@@ -97,12 +99,12 @@ var queryFloor = map[string]string{
 }
 
 // Queries picks a hand-written Russian query line. Safe for concurrent use.
-type Queries struct{ d *deck }
+type Queries struct{ d *say.Deck }
 
 // LoadQueries reads the embedded file. Pass a source to make the picking
 // reproducible in tests; nil seeds from the clock.
 func LoadQueries(src rand.Source) (*Queries, error) {
-	d, err := loadDeck(queryJSON, QuerySchemaVersion, queryKeys, queryFloor, src)
+	d, err := say.Load(queryJSON, QuerySchemaVersion, queryKeys, queryFloor, src)
 	if err != nil {
 		return nil, err
 	}
@@ -114,7 +116,7 @@ func LoadQueries(src rand.Source) (*Queries, error) {
 		{QueryWeatherNow, "{location}"}, {QueryWeatherNow, "{temp}"},
 		{QueryWeatherNow, "{word}"}, {QueryWeatherNow, "{condition}"},
 	} {
-		if err := d.requirePlaceholder(req.key, req.ph); err != nil {
+		if err := d.RequirePlaceholder(req.key, req.ph); err != nil {
 			return nil, err
 		}
 	}
@@ -122,20 +124,20 @@ func LoadQueries(src rand.Source) (*Queries, error) {
 }
 
 // deck reads through a nil *Queries, which is the unloadable-file case.
-func (q *Queries) deck() *deck {
+func (q *Queries) deck() *say.Deck {
 	if q == nil {
-		return floorDeck(queryFloor)
+		return say.FloorDeck(queryFloor)
 	}
 	return q.d
 }
 
 // Say returns one line for key, with the values filled into the frame.
 func (q *Queries) Say(key string, vars map[string]string) string {
-	return q.deck().text(key, vars)
+	return q.deck().Text(key, vars)
 }
 
 // Variants returns every line the file can produce, for the persona scorer.
-func (q *Queries) Variants() []string { return q.deck().variants() }
+func (q *Queries) Variants() []string { return q.deck().Variants() }
 
 var (
 	queryOnce sync.Once
@@ -161,5 +163,5 @@ func Q(key string, vars map[string]string) string { return DefaultQueries().Say(
 
 // IsQ reports whether text is a line key could have produced, for the tests.
 func IsQ(key string, vars map[string]string, text string) bool {
-	return DefaultQueries().deck().matches(key, vars, text)
+	return DefaultQueries().deck().Matches(key, vars, text)
 }