Phase 6: Ingest pipeline — CSV, JSON, PDF, text file support

- ingestd crate: detect file type → parse → schema detection → Parquet → catalog
- CSV: auto-detect column types (int, float, bool, string), handles $, %, commas
  Strips dollar signs from amounts, flexible row parsing, sanitized column names
- JSON: array or newline-delimited, nested object flattening (a.b.c → a_b_c)
- PDF: text extraction via lopdf, one row per page (source_file, page_number, text)
- Text/SMS: line-based ingestion with line numbers
- Dedup: SHA-256 content hash, re-ingest same file = no-op
- Gateway: POST /ingest/file multipart upload, 256MB body limit
- Schema detection per ADR-010: ambiguous types default to String
- 12 unit tests passing (CSV parsing, JSON flattening, type inference, dedup)
- Tested: messy CSV with missing data, dollar amounts, N/A values → queryable

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/gateway/src/main.rs

@@ -1,7 +1,7 @@
 mod auth;
 mod observability;
 
-use axum::{Router, routing::get};
+use axum::{Router, extract::DefaultBodyLimit, routing::get};
 use proto::lakehouse::catalog_service_server::CatalogServiceServer;
 use shared::config::Config;
 use tower_http::cors::{Any, CorsLayer};
@@ -39,10 +39,14 @@ async fn main() {
     // HTTP router
     let mut app = Router::new()
         .route("/health", get(health))
-        .nest("/storage", storaged::service::router(store))
+        .nest("/storage", storaged::service::router(store.clone()))
         .nest("/catalog", catalogd::service::router(registry.clone()))
         .nest("/query", queryd::service::router(engine))
-        .nest("/ai", aibridge::service::router(ai_client));
+        .nest("/ai", aibridge::service::router(ai_client))
+        .nest("/ingest", ingestd::service::router(ingestd::service::IngestState {
+            store: store.clone(),
+            registry: registry.clone(),
+        }));
 
     // Auth middleware (if enabled)
     if config.auth.enabled {
@@ -58,6 +62,7 @@ async fn main() {
     }
 
     app = app
+        .layer(DefaultBodyLimit::max(256 * 1024 * 1024)) // 256MB
         .layer(CorsLayer::new()
             .allow_origin(Any)
             .allow_methods(Any)