Fix review findings R1–R3 on Regular grounding and name folding

R1: Migration 0010 now writes revision 0 into every ground_dinner job
payload that has none. Jobs queued before the upgrade carry only
dinner_id, so the boot cleanup, which matches a pending dinner to its job
by revision, failed those dinners as interrupted while their jobs were
still queued. The migration runs before the job runner starts. A new test
migrates a database to 0009, adds a pending Regular with a legacy queued
job, upgrades and boots, and checks the dinner stays pending and is then
grounded.

R2: Archiving a dinner, or renaming a pending one, now cancels the
grounding of any ground_dinner job running for it at an older revision,
so no further search, page fetch, photo download or model call is made.
The job is registered before it reads the dinner, so an archive or rename
committed after that read always finds it. A stopped job succeeds and
reports the dinner's current grounding status. The archive and rename
tests now check that the job ends while its search is still held, with
no page fetched and no model call for the stale name.

R3: gen_folds.py writes web/src/dinners/letterFolds.json from the same
table as folds_table.go, and names.ts folds through it instead of a
hand-copied subset. names.ts also lowercases letter by letter, as Go's
strings.ToLower does, rather than by context. TestLetterFoldsMatchPWA
fails when the two tables differ. The shared cases add "Ƈhili", "Ꞔarbanzo
Stew" and "ΜΟΥΣΑΚΑΣ" (final sigma).

Maestro task 5037ff86-181d-448e-927b-c2fd2258a25d.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/dinners/dinners.go

@@ -11,9 +11,11 @@ import (
 	"errors"
 	"fmt"
 	"log/slog"
+	"math"
 	"net/url"
 	"slices"
 	"strings"
+	"sync"
 	"unicode"
 	"unicode/utf8"
 
@@ -130,6 +132,11 @@ type Service struct {
 	grounder  *recipes.Grounder
 	logger    *slog.Logger
 	groundJob *jobs.Kind[GroundJob]
+
+	// groundingsMu guards groundings: the KindGroundDinner jobs running,
+	// by dinner id, so archiving or renaming a dinner can stop them.
+	groundingsMu sync.Mutex
+	groundings   map[string]map[*runningGrounding]struct{}
 }
 
 // NewService returns a service over st that grounds dinners with grounder
@@ -146,7 +153,7 @@ func NewService(st *store.Store, grounder *recipes.Grounder, runner *jobs.Runner
 	case logger == nil:
 		return nil, errors.New("dinners: nil logger")
 	}
-	s := &Service{st: st, grounder: grounder, logger: logger}
+	s := &Service{st: st, grounder: grounder, logger: logger, groundings: make(map[string]map[*runningGrounding]struct{})}
 	kind, err := jobs.Register(runner, KindGroundDinner, s.runGroundJob, Reasons...)
 	if err != nil {
 		return nil, err
@@ -296,7 +303,7 @@ func (s *Service) List(ctx context.Context, status string) ([]Dinner, error) {
 // clears its recipe_url, raises its grounding_revision and enqueues a fresh
 // KindGroundDinner job that grounds the new name: a job queued or running
 // for the old name or link carries the old revision, so it can no longer
-// write the dinner.
+// write the dinner, and one running is stopped.
 func (s *Service) Update(ctx context.Context, id string, p Patch, updatedBy string) (Dinner, error) {
 	if updatedBy == "" {
 		return Dinner{}, errors.New("dinners: update: no member to record as updated_by")
@@ -368,6 +375,7 @@ func (s *Service) Update(ctx context.Context, id string, p Patch, updatedBy stri
 		return Dinner{}, err
 	}
 	if regrounding {
+		s.stopGroundings(row.ID, row.GroundingRevision)
 		jobID, err := s.enqueueGrounding(ctx, row.ID, row.GroundingRevision)
 		if err != nil {
 			return Dinner{}, err
@@ -383,7 +391,8 @@ func (s *Service) Update(ctx context.Context, id string, p Patch, updatedBy stri
 }
 
 // Archive sets dinner id's status to archived, recording updatedBy. The row
-// is kept, so its name still counts for Side quest dedupe.
+// is kept, so its name still counts for Side quest dedupe. A
+// KindGroundDinner job running for it is stopped.
 func (s *Service) Archive(ctx context.Context, id, updatedBy string) (Dinner, error) {
 	if updatedBy == "" {
 		return Dinner{}, errors.New("dinners: archive: no member to record as updated_by")
@@ -399,6 +408,7 @@ func (s *Service) Archive(ctx context.Context, id, updatedBy string) (Dinner, er
 	if err != nil {
 		return Dinner{}, fmt.Errorf("dinners: archive %s: %w", id, err)
 	}
+	s.stopGroundings(row.ID, math.MaxInt64)
 	return fromRow(row), nil
 }