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, 25 insertions, 0 deletions

diff --git a/ride/difficulty_example_test.go b/ride/difficulty_example_test.go
new file mode 100644
index 0000000..bd87f58
--- /dev/null
+++ b/ride/difficulty_example_test.go
@@ -0,0 +1,25 @@
+package ride_test
+
+import (
+	"testing"
+
+	"github.com/martinlehoux/biking_home/climb"
+	"github.com/martinlehoux/biking_home/ride"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCotacolExampleRide(t *testing.T) {
+	r, err := ride.ParseFile(parser, "../examples/2022-07-21.Pogacar.gpx")
+	assert.NoError(t, err)
+	assert.InDelta(t, 3049.0, climb.Cotacol(r.Distances, r.Elevations), 1)
+}
+
+func TestCotacolHautacamClimbfinderReference(t *testing.T) {
+	r, err := ride.ParseFile(parser, "../examples/2022-07-21.Pogacar.gpx")
+	assert.NoError(t, err)
+	detected := climb.Detect(r.Route, nil, climb.ClimbSlopeMinimum)
+	assert.Len(t, detected, 6)
+	hautacam := detected[5].Climb
+	assert.InDelta(t, 128.6, hautacam.Distances[0]/1000, 0.1)
+	assert.InDelta(t, 930.0, hautacam.DifficultyScore(), 10)
+}