Extract climb detection into a dedicated climb package

Move climb detection, slope, and Cotacol scoring out of ride into a new
climb package that operates on a geometry-only Route (distances, elevations,
coords). Ride embeds climb.Route and keeps its timing and telemetry columns.

- climb.Detect returns []DetectedClimb (Climb + ride-absolute Start).
- Climb owns its sliced geometry; indices are local, with Start reported at
  the detection boundary for absolute position.
- Detected bounds use core.Interval; freeRegions claim suppression fixed.
- ride no longer builds slices: ClimbFromDist/ClimbFromIndexes/climbFrom and
  ride.Climb/Interval/Range are removed; rideanalysis, mountain_pass MatchClimb,
  and web views are rewired to climb types.
- New internal/routetest builds climb.Route from the ride DSL; ridetest reuses
  it and adds timestamps and telemetry.
- Tests moved to climb (synthetic detection and difficulty) and kept in ride
  for GPX-example integration; ride.comparison detection coverage retained.
- mountain_pass.nearestCrossing now reuses geo.Nearest.

1 files changed, 4 insertions, 3 deletions

diff --git a/ride/store.go b/ride/store.go
index 2d022ad..b906b42 100644
--- a/ride/store.go
+++ b/ride/store.go
@@ -7,6 +7,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/martinlehoux/biking_home/climb"
 	"github.com/martinlehoux/kagamigo/kcore"
 )
 
@@ -57,8 +58,8 @@ func Save(db *sql.DB, r StoredRide) error {
 		if err != nil {
 			return fmt.Errorf("compute ride values for %q: %w", r.ExternalID, err)
 		}
-		cotacolScore = Cotacol(parsed)
-		cotacolAlgorithmVersion = CotacolAlgorithmVersion
+		cotacolScore = climb.Cotacol(parsed.Distances, parsed.Elevations)
+		cotacolAlgorithmVersion = climb.CotacolAlgorithmVersion
 		movingTimeS = int64(MovingTime(parsed) / time.Second)
 		movingTimeAlgorithmVersion = MovingTimeAlgorithmVersion
 	}
@@ -151,7 +152,7 @@ func ListSorted(db *sql.DB, column SortColumn, descending bool) ([]StoredRide, e
 		args = append(args, MovingTimeAlgorithmVersion)
 	} else if isComputedSort(column) {
 		query += "(cotacol_score IS NULL OR cotacol_algo_version IS NULL OR cotacol_algo_version <> ? OR distance_m <= 0) ASC, "
-		args = append(args, CotacolAlgorithmVersion)
+		args = append(args, climb.CotacolAlgorithmVersion)
 	}
 	query += expression + " " + direction + ", id DESC"
 	rows, err := db.Query(query, args...)