Tech debt: delete com.example.androidapp ghost package, symlink TackDetector, fix forecast current hour

- Deleted all 18 stale source files in com.example.androidapp (main + test)
  that duplicated org.terst.nav implementations from an earlier namespace
- Fixed the 3 tide model files (TidePrediction/Station/Constituent) whose
  package declarations read com.example.androidapp.data.model despite living
  in org.terst.nav.data.model directories
- Fixed HarmonicTideCalculator.kt imports to match the corrected package
- Fixed TideModelTest.kt package declaration
- Migrated HarmonicTideCalculatorTest to org.terst.nav.tide with correct imports
- Replaced test-runner's TackDetector.kt copy with a symlink to the android-app
  canonical source so the two can never diverge again
- Fixed addGpsPoint to pick the current wall-clock hour's forecast slot instead
  of always using the app-start hour (first item in forecast list)

https://claude.ai/code/session_01KXYBuAHZkvv63DeUG6XaZD

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