conductor(plan): Mark Phase 2 tasks as complete

conductor/tracks/fix_river_continuity_20260203/plan.md

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+# Implementation Plan - Fix River Continuity
+
+## Phase 1: Investigation & Reproduction
+- [x] Task: Create a unit test in `tests/test_river_continuity.py`.
+    - [x] Create two adjacent tiles (simulated).
+    - [x] Run `_build_flow_distance` for both (with overlapping mosaics).
+    - [x] Assert that the depth/distance values at the shared edge are identical.
+
+## Phase 2: Logic Fixes
+- [x] Task: Review and fix Grid Alignment in `river_erosion.py` (e0a4e9c).
+    - [ ] Ensure `_tile_geotransform` uses a global origin snapping if needed.
+    - [ ] Verify `mosaic_bounds` calculation.
+- [x] Task: Improve Rasterization Quality. (e0a4e9c)
+    - [ ] Consider densifying geometries before rasterization to ensure smooth gradients.
+
+## Phase 3: Verification
+- [ ] Task: Run the pipeline on a 2x1 tile area.
+- [ ] Task: Inspect the seam.
+