v0.2.6

latere-cli v0.2.6 adds backend-backed one-shot Cella execution.

Highlights:

• Adds latere cella run --ephemeral --rm -- .
• Calls POST /v1/one-shot-runs instead of locally orchestrating create, exec, and delete.
• Prints command stdout/stderr plus sandbox create, command, cleanup, and total timings.
• Adds one-shot flags: --image, --disk, --timeout, and --json.
• Updates README quickstart and command docs.

Verification:

• go test ./...