Agent: add the corrective tools the toolbox was missing (#85 item 3)

The toolbox could create and move but not delete or resize; write the
journal but not read it; clear a whole bed but not pull one plant; report
seed remaining but not record a purchase. Close those gaps with thin
adapters over the SAME service methods the REST API uses, so they inherit
the permission checks unchanged:

  read_journal    → ListJournal   (the write/read asymmetry, most visible)
  update_object   → UpdateObject  (resize / rotate / rename / plantable)
  delete_object   → DeleteObject  (counterpart to create_object)
  remove_planting → UpdatePlanting (soft-remove ONE plop, like clear does)
  list_seed_lots  → ListSeedLots
  record_seed_lot → CreateSeedLot (record a purchase; "I bought 2 packets")

To address a single plop the agent needs its id + version, so
DescribePlanting now carries both — the same way DescribeObject.Version
already lets it edit an object. remove_planting soft-removes (removed_at =
today), mirroring clear_object, so the plant stays in planting history and
the change is undoable.

Deferred deliberately: an undo/revert tool needs a way to list recent
change sets to get a changeSetId, which is a larger addition; noted on the
issue for a follow-up.

Tested through the tool layer (TestCorrectiveTools): resize, single-plop
removal, journal read-back, seed-lot record+list, and delete.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01H3zbym8Doka2d7D48maSgZ

internal/service/ops.go

@@ -471,7 +471,11 @@ type DescribeObject struct {
 }
 
 // DescribePlanting is one plop with a rough compass location, for DescribeResult.
+// ID + Version are included so an agent can address a single plop — remove it or
+// move it — the same way DescribeObject.Version lets it edit an object.
 type DescribePlanting struct {
+	ID       int64   `json:"id"`
+	Version  int64   `json:"version"`
 	PlantID  int64   `json:"plantId"`
 	Plant    string  `json:"plant"`
 	Count    int     `json:"count"`
@@ -518,6 +522,8 @@ func (s *Service) DescribeGarden(ctx context.Context, actorID, gardenID int64) (
 				count = *pl.Count
 			}
 			do.Plantings = append(do.Plantings, DescribePlanting{
+				ID:       pl.ID,
+				Version:  pl.Version,
 				PlantID:  pl.PlantID,
 				Plant:    plantByID[pl.PlantID].Name,
 				Count:    count,