Refactor to local-first architecture on Hetzner NVMe

Remove distributed R2/Iceberg/SSH pipeline architecture in favor of
local subprocess execution with NVMe storage. Landing data backed up
to R2 via rclone timer.

- Strip Iceberg catalog, httpfs, boto3, paramiko, prefect, pyarrow
- Pipelines run via subprocess.run() with bounded timeouts
- Extract writes to {LANDING_DIR}/psd/{year}/{month}/{etag}.csv.gzip
- SQLMesh reads LANDING_DIR variable, writes to DUCKDB_PATH
- Delete unused provider stubs (ovh, scaleway, oracle)
- Add rclone systemd timer for R2 backup every 6h
- Update supervisor to run pipelines with env vars

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/materia/cli.py

@@ -80,15 +80,12 @@ app.add_typer(pipeline_app, name="pipeline")
 @pipeline_app.command("run")
 def pipeline_run(
     name: Annotated[str, typer.Argument(help="Pipeline name (extract, transform)")],
-    worker_type: Annotated[str | None, typer.Option("--worker", "-w")] = None,
-    provider: Annotated[str, typer.Option("--provider", "-p")] = "hetzner",
-    keep: Annotated[bool, typer.Option("--keep", help="Keep worker after completion")] = False,
 ):
-    """Run a pipeline on an ephemeral worker."""
+    """Run a pipeline locally."""
     from materia.pipelines import run_pipeline
 
     typer.echo(f"Running pipeline '{name}'...")
-    result = run_pipeline(name, worker_type, auto_destroy=not keep, provider=provider)
+    result = run_pipeline(name)
 
     if result.success:
         typer.echo(result.output)
@@ -105,7 +102,8 @@ def pipeline_list():
 
     typer.echo("Available pipelines:")
     for name, config in PIPELINES.items():
-        typer.echo(f"  • {name:<15} (worker: {config.worker_type}, artifact: {config.artifact})")
+        cmd = " ".join(config["command"])
+        typer.echo(f"  • {name:<15} (command: {cmd}, timeout: {config['timeout_seconds']}s)")
 
 
 secrets_app = typer.Typer(help="Manage secrets via Pulumi ESC")