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+<!-- codex-wiki-sync:c9375f025d2593058f6b617b -->
+
+> Mirrored from `/mnt/DATA/git/pikebacker/codex/IMPLEMENTATION_TASKS.md`.
+> Origin: `repository`.
+> Active tasks and changing state belong in Gitea issues; this wiki page is durable project context.
+
+---
+# Implementation Tasks for Codex
+
+## Task 1 — Create monorepo scaffold
+
+Create:
+
+```text
+apps/web
+apps/mobile
+services/api
+services/data-pipeline
+packages/shared
+```
+
+Acceptance criteria:
+
+- root package/workspace or equivalent created;
+- lint/test scripts documented;
+- shared domain types imported by web/API where applicable;
+- `.env.example` files created;
+- no API keys committed.
+
+## Task 2 — Implement shared domain types and scoring
+
+Implement TypeScript types from `schemas/domain_types.ts`.
+
+Add pure functions:
+
+- `scoreSegment(segment, profile)`;
+- `scoreRoute(route, profile)`;
+- `detectCriticalGaps(route, pois, thresholds)`;
+- `estimateHikeABikeRisk(segment, profile)`.
+
+Acceptance criteria:
+
+- unit tests pass;
+- sample scoring fixture returns expected warnings;
+- profile thresholds are configurable.
+
+## Task 3 — Backend API mock MVP
+
+Implement endpoints from `schemas/openapi.yaml` with mock data:
+
+- `POST /v1/routes/plan`,
+- `POST /v1/stages/plan`,
+- `GET /v1/routes/{id}/pois`,
+- `GET /v1/routes/{id}/gaps`,
+- `POST /v1/offline-packs`,
+- `GET /v1/routes/{id}/export?format=gpx`,
+- `POST /v1/reports`.
+
+Acceptance criteria:
+
+- returns deterministic responses from `examples/`;
+- API validation is implemented;
+- tests cover success and error cases.
+
+## Task 4 — Stage planner
+
+Implement stage splitting:
+
+- respect min/max daily distance;
+- prefer endpoints near sleep options;
+- avoid long water/food gaps at stage end;
+- include Plan A/B endpoints;
+- generate warnings.
+
+Acceptance criteria:
+
+- 3-day and 5-day fixture routes produce plausible stages;
+- no stage exceeds hard constraints unless warning returned;
+- sleep candidates attached to each stage.
+
+## Task 5 — Web planner UI
+
+Build a web UI:
+
+- trip request form;
+- map panel;
+- stage timeline;
+- POI filter toggles;
+- warnings panel;
+- export/offline buttons.
+
+Acceptance criteria:
+
+- user can submit sample trip and see route/stages;
+- route-corridor POIs shown/listed;
+- critical warnings visible;
+- GPX export downloads.
+
+## Task 6 — GPX export
+
+Generate valid GPX with:
+
+- route geometry;
+- waypoints for stage endpoints;
+- optional POIs/course points;
+- metadata and attribution.
+
+Acceptance criteria:
+
+- validates as XML;
+- imports into common route viewers;
+- includes stage waypoints.
+
+## Task 7 — Offline pack manifest
+
+Implement offline manifest generation.
+
+Acceptance criteria:
+
+- includes route, stages, POIs, rules, exports, data versions;
+- marks unavailable layers clearly;
+- supports future tile pack file references.
+
+## Task 8 — Data pipeline skeleton
+
+Implement scripts/docs for:
+
+- reading OSM PBF extract;
+- extracting POI categories;
+- normalizing tags;
+- inserting into PostGIS;
+- importing protected areas/rule cards later.
+
+Acceptance criteria:
+
+- one small sample extract/fixture works;
+- schema migrations documented;
+- source attribution stored.
+
+## Task 9 — Provider adapters
+
+Add adapters:
+
+- mock routing provider;
+- openrouteservice provider placeholder;
+- GraphHopper/Valhalla adapter interfaces;
+- OSM POI provider.
+
+Acceptance criteria:
+
+- provider selected via environment/config;
+- mock provider is default;
+- external provider failures return actionable errors.
+
+## Task 10 — Community reports
+
+Implement structured report model and UI submission.
+
+Acceptance criteria:
+
+- reports typed and dated;
+- offline queue represented;
+- reports can attach to route meters/location;
+- moderation status supported.