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, 6 insertions, 5 deletions

diff --git a/ride/store_test.go b/ride/store_test.go
index 89c4830..1ee3c69 100644
--- a/ride/store_test.go
+++ b/ride/store_test.go
@@ -7,6 +7,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/martinlehoux/biking_home/climb"
 	"github.com/martinlehoux/biking_home/internal/dbtest"
 	"github.com/martinlehoux/kagamigo/kcore"
 	"github.com/stretchr/testify/assert"
@@ -53,7 +54,7 @@ func TestUpsertAndGet(t *testing.T) {
 	score, found := got.CotacolScore()
 	require.True(t, found)
 	assert.Greater(t, score, 0.0)
-	assert.Equal(t, CotacolAlgorithmVersion, got.CotacolAlgorithmVersion())
+	assert.Equal(t, climb.CotacolAlgorithmVersion, got.CotacolAlgorithmVersion())
 
 	_, ok, err = GetByExternalID(db, "strava:9999")
 	require.NoError(t, err)
@@ -89,7 +90,7 @@ func TestSaveComputesCotacol(t *testing.T) {
 	score, found := got.CotacolScore()
 	require.True(t, found)
 	assert.Greater(t, score, 0.0)
-	assert.Equal(t, CotacolAlgorithmVersion, got.CotacolAlgorithmVersion())
+	assert.Equal(t, climb.CotacolAlgorithmVersion, got.CotacolAlgorithmVersion())
 }
 
 func TestSaveComputesMovingTimeAndPreservesExternal(t *testing.T) {
@@ -190,7 +191,7 @@ func TestBackfill(t *testing.T) {
 	require.True(t, ok)
 	_, found := got.CotacolScore()
 	assert.True(t, found)
-	assert.Equal(t, CotacolAlgorithmVersion, got.CotacolAlgorithmVersion())
+	assert.Equal(t, climb.CotacolAlgorithmVersion, got.CotacolAlgorithmVersion())
 
 	count, err = Backfill(db)
 	require.NoError(t, err)
@@ -277,7 +278,7 @@ func TestListSortedByCotacolKeepsStaleLast(t *testing.T) {
 		UPDATE rides
 		SET cotacol_score = CASE external_id WHEN ? THEN 4 ELSE 6 END,
 			cotacol_algo_version = ?
-	`, first.ExternalID, CotacolAlgorithmVersion)
+	`, first.ExternalID, climb.CotacolAlgorithmVersion)
 	require.NoError(t, err)
 
 	items, err := ListSorted(db, SortCotacol, false)
@@ -307,7 +308,7 @@ func TestListSortedByCotacolPer100Km(t *testing.T) {
 		UPDATE rides
 		SET cotacol_score = CASE external_id WHEN ? THEN 4 ELSE 6 END,
 			cotacol_algo_version = ?
-	`, first.ExternalID, CotacolAlgorithmVersion)
+	`, first.ExternalID, climb.CotacolAlgorithmVersion)
 	require.NoError(t, err)
 
 	items, err := ListSorted(db, SortCotacolKm, false)