Add API_CHANGES.md: comprehensive documentation of 5-phase refactor impact

Phase 5: Drip Manifold Alignment - valve-proximity manifold selection

Multi-pump optimization: Voronoi service partitioning and scoped valve placement

Fix zigzag zone boundaries: correct strip generation coordinate math

Fix lateral parallelism and uniformity: use farm-level direction for consistent lateral angles

Improve crop-aware zone generation: generate rectangular strips per-crop instead of post-hoc clipping

Implement Changes 4.2 and 5.1-5.2: Multi-source water support and crop-aware zone refinement

Change 3: Implement pipe network topology generation

Change 2: Implement strip-based rectangular zone splitting

Change 1: Implement global lateral orientation with compute_farm_axis

Add area_unit parameter to REST API with 28+ supported units

Fix: use GRADIO_SSR_MODE env var instead of constructor param

Fix SSR 405: disable ssr_mode, restore mount_gradio_app for custom routes

Change REST API prefix from /api/v1 to /rest/v1

Fix Gradio static asset 404s: use demo.app instead of mount_gradio_app

Update Gradio sdk_version to 6.14.0 to fix static asset 404s

Improve design_api accuracy: crop propagation, valve distribution, smart centralized default, BOM pricing, UTM caching

Add configurable INR pricing system with regional overrides

Add REST /api/v1/design endpoint accepting farm/plots/water_sources

Add redesign mode to allow parameter updates

Integrate smart farm data collection into chat interface

Switch to direct HTTP API calls with smart fallback

Switch to FLAN-T5 model with text2text API

Fix Gradio Chatbot format - use proper message dictionaries

Fix LLM API format error - use text_generation instead of chat_completion

Add conversational LLM layer for farmer guidance

Remove map visualization: drop Draw on Map tab, Leaflet, and Folium

fix: gr.File type parameter (binary not file)

fix: replace embedded map with downloadable .html file (escape Svelte entirely)

fix: add every=False to gr.HTML map components (prevent polling re-renders)

fix: escape Svelte reactivity loop in map output (data-URI iframe)

feat: show irrigation design output on OpenStreetMap via Folium

feat: add Simple Form and Draw on Map UI tabs (OpenStreetMap, no API key)

fix: add area-density floor to valve placement (5 valves/ha generic)

feat: multi-unit input/display support + valve engine corrections

Phase 1.5 complete: GeoJSON pipeline + design API + dual-mode Gradio UI

Add JSON integration schemas for user app interop

Revert to working Gradio 6.13.0 config (commit e707387 was RUNNING)

Remove share=True to fix huggingface_hub import conflict

Fix: use Gradio 5.4.0 (stable, works on HF Spaces)

Fix HF Space: downgrade Gradio to stable version 4.44.1

Enable Gradio share mode for team testing

Phase 1.5: valve placement engine with hierarchical decision matrix

Fix runtime error: remove unsupported run_on_load from gr.Examples

Fix HF Space build: unpin shapely to use prebuilt wheels

Phase 1: geometry engine + Gradio UI for drip irrigation design

initial commit